Forum Discussion
Turn off Details panel on new SharePoint lists
You could try this https://blog.kushanperera.com/2018/12/turn-off-hide-details-panel-information.html until Microsoft listen to UserVoice.
It worked for me!
And... keep voting https://sharepoint.uservoice.com/forums/329214-sites-and-collaboration/suggestions/34110010-hide-disable-the-recent-activity-in-the-details-pa#comments
Add your custom Content Type to the list - this is only to introduce the custom columns to the list.
Add Item as the Default content type.
turn off allow management of content types.
Now, your powerapps form will have access to all of the columns in the list, but the details panel will only show the Title column.
Items will be "Items" and not your custom content type.
If you need them to be a custom content type, then clone Item with a custom name and set it as the default content type (instead of Item), and have a "master" custom content type that has all of the custom columns.
*Before turning off Allow Management of Content Types, you may need to update all existing list items to be "Items" instead of your custom content type.