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On Windows, there are three ways of content being displayed on screen. The default is software, which is slower, but the most compatible. There are two other options that are faster: OpenGL and ANGLE. They are faster, but they may not work, or may cause display issues such as missing menubars, blank windows, and so on. Which one works best will depend on your computer.

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Changing the Driver From the Preferences Screen

In Anki 23.10+, you can change the graphics driver from preferences screen by navigating to Tools → Preferences and then selecting the driver from the dropdown menu.

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Changing the Driver From the Command Line

If you run into display issues, you can try switching to software mode via cmd: 
echo software > %APPDATA%\Anki2\gldriver6
Or you can do it via PowerShell: 
echo software > $env:APPDATA\Anki2\gldriver6
It will not print anything. You can then start Anki again. To revert to the default behaviour, change software to auto, or delete that file.

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Full Screen

Anki 2.1.50+ comes with a full screen mode, but due to various issues, it had to be disabled while OpenGL is used. Turning on software rendering as described above will allow the full screen option to be used, though please bear in mind that rendering performance may suffer. In Anki 23.10+, full screen mode is supported with the default Direct3D driver.