Cells Can Be Seen Popping in and out After Clearing or Collapsing Output

[cbzoozoom7]

Description

After collapsing or clearing all output, cells can be seen appearing and disappearing on screen when scrolling. This can leaves the bottom half of your screen blank (or maybe the whole screen if the document is long enough). This makes it difficult to fit a lot on screen and casts doubt on whether you are actually seeing the bottom of the document when you get to the bottom

Reproduce

Open a long notebook with lots of long output.
Use View > Collapse All Outputs or Kernel > Restart Kernel and Clear Outputs of All Cells to get rid of the output.
Scroll down and observe how Jupyter becomes confused about the location of the bottom of the screen. As you scroll down, blank background scrolls into view, and cells don't appear on it until it reaches the middle of the screen. As you scroll up, cells disappear once they descend to the middle of the screen.

Expected behavior

This culling should be happening off screen.

Context

• Operating System and version: MacOS 26.0 Tahoe arm64
• Browser and version: Safari 26.0 (21622.1.22.11.14) and Chrome 140.0.7339.133

• Jupyter Notebook version: 7.4.5

Troubleshoot Output

$PATH:
	/Library/Frameworks/Python.framework/Versions/3.13/bin
	/opt/homebrew/bin
	/opt/homebrew/sbin
	/usr/local/bin
	/System/Cryptexes/App/usr/bin
	/usr/bin
	/bin
	/usr/sbin
	/sbin
	/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/local/bin
	/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/bin
	/var/run/com.apple.security.cryptexd/codex.system/bootstrap/usr/appleinternal/bin
	/Library/Apple/usr/bin
	/Library/Frameworks/Mono.framework/Versions/Current/Commands
sys.path:

/opt/homebrew/Cellar/jupyterlab/4.4.7/libexec/bin

/opt/homebrew/Cellar/python@3.13/3.13.7/Frameworks/Python.framework/Versions/3.13/lib/python313.zip

/opt/homebrew/Cellar/python@3.13/3.13.7/Frameworks/Python.framework/Versions/3.13/lib/python3.13

/opt/homebrew/Cellar/python@3.13/3.13.7/Frameworks/Python.framework/Versions/3.13/lib/python3.13/lib-dynload

/opt/homebrew/Cellar/jupyterlab/4.4.7/libexec/lib/python3.13/site-packages

/opt/homebrew/opt/certifi/lib/python3.13/site-packages

/opt/homebrew/lib/python3.13/site-packages
sys.executable:

/opt/homebrew/Cellar/jupyterlab/4.4.7/libexec/bin/python
sys.version:

3.13.7 (main, Aug 14 2025, 11:12:11) [Clang 17.0.0 (clang-1700.0.13.3)]
platform.platform():

macOS-26.0-arm64-arm-64bit-Mach-O
which -a jupyter:

/opt/homebrew/bin/jupyter
pip list:

Package                   Version

------------------------- --------------

anyio                     4.10.0

appnope                   0.1.4

argon2-cffi               25.1.0

argon2-cffi-bindings      25.1.0

arrow                     1.3.0

asttokens                 3.0.0

async-lru                 2.0.5

attrs                     25.3.0

babel                     2.17.0

beautifulsoup4            4.13.5

bleach                    6.2.0

certifi                   2025.8.3

cffi                      1.17.1

charset-normalizer        3.4.3

comm                      0.2.3

contourpy                 1.3.3

cycler                    0.12.1

debugpy                   1.8.16

decorator                 5.2.1

defusedxml                0.7.1

executing                 2.2.1

fastjsonschema            2.21.2

fonttools                 4.59.2

fqdn                      1.5.1

h11                       0.16.0

hatch-jupyter-builder     0.9.1

hatch-nodejs-version      0.4.0

hatchling                 1.27.0

httpcore                  1.0.9

httpx                     0.28.1

idna                      3.10

ipykernel                 6.30.1

ipython                   9.5.0

ipython_pygments_lexers   1.1.1

isoduration               20.11.0

jedi                      0.19.2

Jinja2                    3.1.6

json5                     0.12.1

jsonpointer               3.0.0

jsonschema                4.25.1

jsonschema-specifications 2025.4.1

jupyter_client            8.6.3

jupyter-console           6.6.3

jupyter_core              5.8.1

jupyter-events            0.12.0

jupyter-lsp               2.3.0

jupyter_server            2.17.0

jupyter_server_terminals  0.5.3

jupyterlab                4.4.7

jupyterlab_pygments       0.3.0

jupyterlab_server         2.27.3

kiwisolver                1.4.9

lark                      1.2.2

MarkupSafe                3.0.2

matplotlib                3.10.6

matplotlib-inline         0.1.7

mistune                   3.1.4

nbclient                  0.10.2

nbconvert                 7.16.6

nbformat                  5.10.4

nest_asyncio              1.6.0

notebook                  7.4.5

notebook_shim             0.2.4

numpy                     2.3.3

packaging                 25.0

pandocfilters             1.5.1

parso                     0.8.5

pathspec                  0.12.1

pexpect                   4.9.0

pillow                    11.3.0

pip                       25.2

platformdirs              4.4.0

pluggy                    1.6.0

prometheus_client         0.22.1

prompt_toolkit            3.0.52

psutil                    7.0.0

ptyprocess                0.7.0

pure_eval                 0.2.3

pycparser                 2.22

Pygments                  2.19.2

pyparsing                 3.2.3

python-dateutil           2.9.0.post0

python-json-logger        3.3.0

PyYAML                    6.0.2

pyzmq                     27.0.2

referencing               0.36.2

requests                  2.32.5

rfc3339_validator         0.1.4

rfc3986_validator         0.1.1

rfc3987-syntax            1.1.0

rpds-py                   0.27.1

Send2Trash                1.8.3

setuptools                80.9.0

six                       1.17.0

sniffio                   1.3.1

soupsieve                 2.8

stack_data                0.6.3

terminado                 0.18.1

tinycss2                  1.4.0

tornado                   6.5.2

traitlets                 5.14.3

trove-classifiers         2025.8.26.11

types-python-dateutil     2.9.0.20250822

typing_extensions         4.15.0

uri-template              1.3.0

urllib3                   2.5.0

wcwidth                   0.2.13

webcolors                 24.11.1

webencodings              0.5.1

websocket-client          1.8.0

wheel                     0.45.1

Command Line Output

Paste the output from your command line running `jupyter notebook` here, use `--debug` if possible.

Browser Output

Paste the output from your browser Javascript console here, if applicable.

[RRosio]

Thank you for opening this issue @cbzoozoom7, this issue seems similar to existing issues reported in the jupyterlab: jupyterlab/jupyterlab#16677, jupyterlab/jupyterlab#17023, jupyterlab/jupyterlab#17867 (comment) are a few. If you can take a look through these and pinpoint which aligns most with the issue you are experiencing that would be helpful. There may also be other issues similar to this already reported here, I will take a look and add any I find.

[cbzoozoom7]

I've reviewed your links and can confirm that this issue is the same as 17867. Thanks for the link to the helpful comment. I'll try that. Consider fixing the default settings. You're doing great work!