Update, disable, and uninstall
Update
Your code editor updates ReSharper from the gallery it is configured to use: the Visual Studio Code Marketplace in Visual Studio Code, and the Open VSX Registry in Cursor and Antigravity IDE. If you have turned automatic updates off, open the Extensions view and update ReSharper from there.
A new extension version can require a new backend. When it does, the updated backend is downloaded the next time you open a solution, so the first analysis after an update takes longer than usual.
Disable
You can turn ReSharper off without removing it, for example to compare its behavior against the Microsoft C# extension.
Open the Extensions view and find ReSharper.
Select Disable to turn it off everywhere, or Disable (Workspace) to turn it off for the current workspace only.
Reload the window when your editor prompts you to.
Uninstall
Open the Extensions view, find ReSharper, and select Uninstall.
Reload the window.
To reclaim disk space, delete the backend that ReSharper downloaded on first use. The backend is stored outside the extension directory, so uninstalling the extension leaves it in place.