Clicking the 'Add Microsoft account' button while the Launcher is in fullscreen mode does not properly update the size of the sign in window

The bug

In macOS, when the Launcher window is set to fullscreen mode, the Microsoft account sign in window is opened in a new tab. However, the size of the content in this tab is not properly updated, making it appear the same size as it would be in non-fullscreen mode.

A screenshot of this is attached, and can be found below.

How to reproduce

1. Set the Launcher to fullscreen mode by clicking the   icon in the top left corner of the screen
2. Navigate to Settings -> Accounts
3. Click 'Add Microsoft account', and a new tab will open within the window
   Notice how the content is not properly scaled (see screenshot)
4. Switch to the Minecraft Launcher tab, and then back again to the sign in tab
   Notice how the content is now properly scaled

   Screenshot

This is a screenshot of my full computer screen. Notice the black space around the actual content.