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

[harshalk612]

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

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