I am - trying to - running R 4.3.3 on Kubuntu 24.04. The hardware is 8 × Intel® Core™ i3-10100 CPU @ 3.60GHz, with 3.6 GB ram.
Three specific issues are: 1) the console no longer resizes properly anymore, 2) additionally tabs in the source window do not behave properly anymore, and 3) and generally the most irritating is that the graphics export does not work properly. All of these are problems in a project environment, while the graphics work when no project is open. No difficulties seem to encountered working from the command line in the console, outside a project.
An issue with RStudio rather than R itself. Try resetting RStudio's state by renaming or deleting the ~/.config/rstudio folder and restarting. Also, ensure RStudio is updated to the latest version and reinstall it if needed. If the issue persists, test with a fresh user profile or check for conflicting packages in your project environment.