Total Commander

If we call cm_SrcThumbs twice (cm_SrcThumbs and then cm_SrcThumbs again) - we return to previous view mode/columns.
The same is we call cm_SrcQuickview twice, cm_DirBranch twice
If we call cm_SwitchSeparateTree thrice - we return to previous view mode/columns.
But if we call cm_SrcShort or cm_SrcTree - we can't return to previous.

cm_SrcFull, cm_SrcShort, cm_SrcTree and the custom column modes are primary view modes. TC remembers them when you switch to thumbs view or quick view, and returns to that saved mode when you send this command again. However, when you send for example cm_SrcFull, this becomes the new primary view mode. Therefore sending cm_SrcFull again remains in that mode.