I just tried the following and it seems to have worked for me. From kevinushey on this page RStudio Mac OS X 10.15.7 Crashes Everytime - #4 by hender :
It looks like the latest macOS update introduced a driver update that breaks all existing releases of RStudio. See #10020 for more details.
If you need a fix, you can run the following command from the Terminal:
defaults write com.rstudio.desktop
This will force RStudio to use software rendering. You can try and launch RStudio again after making this change.desktop\xb7renderingEngine' 'software'
This will force RStudio to use software rendering. You can try and launch RStudio again after making this change.
Hope this helps.