Source: https://learn.microsoft.com/en-us/answers/questions/760368/disabling-autocompletion-from-spacebar-in-vs-2022

Change the IntelliSense completion mode: 

Edit > IntelliSense > Switch between automatic and tab-only IntelliSense completion or shortcut: Ctrl+Alt+Space.

You can also set the IntelliSense completion mode to Tab-only: 

Tools > Options > Text Editor > Advanced > Default IntelliSense completion mode: > select Tab-only in the dropdown.

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