Just to clarify, unless I’m mistaken, the only way of resetting the loop selection is right-click, clear selection, or right-click, set selection.
Deactivating (L) the Looping function sometimes keeps the brackets up; even when you select something else and play that new selection.
That might be a bug.
Then reactivating (L) the looping shows those old brackets and plays the new selection. It’s a bit messy.
Hence the option to deactivate the looping selection with every L shortcut or Looper button click.