I use Serviio to stream movies from my central PC to two LG

[atc98092]

Resume play is a feature of the player, not Serviio. It's available if the player supports it.

There's no way to "clear" the Recent Watched presentation. You can either hide it completely or change the number of titles displayed (changing the number is a global setting, so impacts the number of newly added titles along with other lists). If you wish to disable that presentation, go to the Serviio console on the Presentations tab and change the display settings there.