Erg mode after workout

Using a wattbike atom.
So following a workout I’d like to sometimes go a bit further but erg mode isn’t resetting and the gearing is fixed on the cool down resistance from the workout final set.
Tryed starting a new route this morning following workout but resistance was still fixed low so had to close the app down and reconnect everything.
Is there a simple solution to this? I’d like to tie done workouts into to long rides but all as one ride so I can also complete longer routes at tge s as me time.