I mainly work with text strings (e.g. URLs) which are relatively long and therefore cannot be displayed completely in the columns. When I try to enlarge the columns, they often jump back to their original width, as can be seen in the GIF (https://www.dropbox.com/s/y29lxyz4irf9rw1/08-07-_2020_09-54-30.gif?dl=0).
Only by enlarging the columns very slowly and with "intermediate stops" I can drag them to the desired width.
I'm working with Windows version 1.3.959. I have had this problem for several versions of RStudio.