If you are using a MacOS system, you may find that your Git tab in RStudio disappears after an upgrade. If that happens, it might mean you need to reinstall some special tools on your system. See this page here. More specifically, you might try this.
In Terminal in RStudio (not the Console that we always use, but the Terminal), type and hit enter:
xcode-select --install
If you need an update, two windows will open (maybe on different screens if you are in fullscreen mode). One is an agreement to terms and conditions (say that you agree) and the next is to install the updated tools. It may take a while, so be sure to have your computer plugged in and be connected to the internet. Once it's all done, restart your computer (if it doesn't automatically) and reopen RStudio. Hopefully your Git tab will return.
If you are using a MacOS system, you may find that your Git tab in RStudio disappears after an upgrade. If that happens, it might mean you need to reinstall some special tools on your system. See this page here. More specifically, you might try this.
If you need an update, two windows will open (maybe on different screens if you are in fullscreen mode). One is an agreement to terms and conditions (say that you agree) and the next is to install the updated tools. It may take a while, so be sure to have your computer plugged in and be connected to the internet. Once it's all done, restart your computer (if it doesn't automatically) and reopen RStudio. Hopefully your Git tab will return.
h/t to @Hazel-2020 for the link