How can I set CollapsedSize to absolute width?

[kobe651jp]

For example, if you set the value to 2.5, in 1920 screen would be 48, and half size would be half the width.

Is there a way to set an absolute width? Like 3rem or 48px.

[bvaughn]

Pixel-based size constraints are not supported. The FAQ covers this:

Can panel sizes be specified in pixels?

No. Pixel-based constraints added significant complexity to the initialization and validation logic and so I've decided not to support them. You may be able to implement a version of this yourself following a pattern like this but it is not officially supported by this library.