Hi Michael,
We didn’t miss it, we chose to release with this functionality to be added in an update.
If you mean deleting flight plans, you unload any flight plan, then in Flights, press the Edit button, select flights you wish to delete, then press Delete.
Unclear why you machine has the slow typing and scrolling. Does this also occur with Charts Cloud.
We are committed to making Charts a great step forward for all in time.
Cheers
Ian