Flashing of the white screen when changing font size of the code

**Describe the bug**
While changing any type of size, there is a white screen flashing in Jupyter Notebook v7

**To Reproduce**
Steps to reproduce the behavior:

1. Go to 'settings/Theme"
2. Click on 'Increase Code Font Size

**Expected behavior**
By clicking normally it should increase the size of the font instead of flashing a white screen.

**Screenshots**
[I Click here for Recording](
https://github.com/jupyter/notebook/assets/106507125/25a8c62f-e4cc-48f8-9869-d8170403b0cb
)

**Desktop (please complete the following information):**

- OS: Windows 11 Pro
- Browser: Chrome
- Version: Jupyter Notebook v7

**Additional context**
Other Bugs are also there in all the menu bars

Start by reproducing the issue in Jupyter Notebook v7 on Windows 11 with Chrome: open settings/Theme and select Increase Code Font Size. Confirm whether the white flash occurs for each font-size change, then verify that the font still increases without the flash and check whether the reported menu-bar bugs are part of the same behavior.

Written by the indexing model from the issue text.