External Editor change is proving difficult

i have been using BBEdit as my text editor, but this evening i bought Sublime Text and want to start using this now, however when i go to Pref/Integrations/ only BBEdit is offered, how do i get Github Desktop to “see” that i now have a second editor, so i can select it?

the answer, was to give it time, this morning there was Sublime Text as an alternative, sorry to be hasty, problem solved