Unable to expand find menu in notebook editor

[devinvalenciano]

Version: 1.64.0-insider (user setup)
Commit: f93c696
Date: 2022-01-25T08:42:41.055Z
Electron: 13.5.2
Chromium: 91.0.4472.164
Node.js: 14.16.0
V8: 9.1.269.39-electron.0
OS: Windows_NT x64 10.0.22000

Testing #141346

Steps to Reproduce:

1. Open notebook editor
2. Open find menu
3. Try to expand the size of the find menu - on my device, I'm unable to. Also, if you look closely, there's a little grey line on the left side of the find menu on Stable that indicates you can drag - I don't see an equivalent on the find menu in the notebook editor.

Clip shows Stable first (grey theme), then Insiders (blue theme)