There is a friend of mine who started his right click as his primary button. While it was easily done in gnome where as in KDE, he is having difficulties.
There is no exact option to do it in a single click. The options I found instead is Left handed mode button which doesn’t make any changes for the mouse.
I don’t know if it’s just us unable to find the settings or it’s just not there… it will be good if anyone can help us.