Feature Request/Bug: Option to auto-clear unpinned tabs when closing a window (Red X) on macOS

[yiyulong]

Describe the issue: I want Zen Browser to behave like a "Clean Slate" every time I close a window and reopen it, without quitting the entire application.

Currently, on macOS, if I have 20+ temporary tabs open and I click the Red "X" button to close the window (while keeping Zen running in the Dock), the next time I click the Zen icon, it restores all those 20+ tabs. I want it to only keep my Pinned Tabs and discard all Unpinned/Temporary Tabs.

Expected behavior: When the last window is closed (but the app is still active), opening a new window should:

Keep Pinned Tabs (Essentials).

Clear all Unpinned Tabs.

Load the New Tab/Homepage.

Environment:

Zen Version: 1.18.3b (Firefox 147.0.2) (arch64)