Disable auto trim/thrust

Apologies for the complete noob question. I play MSFS2020 on my computer with an xbox controller. When flying 747, after take off an auto-thrust seems to be taking over automatically meaning I cannot reduce it. It seems that the landing gear is also automatic and I cannot reopen it when landing with the xbox buttons. I normally fly with the outside camera but with the 747 I have to switch to cockpit view and manually click on the auto throttle to disable it, or on the landing gear lever to lower them. Is there a way to make them completely manual all the time?
Also on all aircrafts, I notice the trim also often changes without me doing anything. Can I also make this fully manual?
Thank you