What worked for me is, in “editor preferences”, under “General - source code” change the source code editor to what you want. after restarting the editor and closing again. you can generate solution via uproject file and open the solution with the right version.
for me, i have a 4.27 unreal project and it sais that it is incompatible with vs 2019. after doing what i descriped it is compatible again with vs 2019