I didn’t quite understand the problem about the background but to get all the rowID of your Airtable table you need to use the following block in the screen start or open event.
Creat a variable and assign it first as empty list then in the open or start event of your screen assign the block [List of Values] to the variable. Remember to change [column 1] in the image to “ID”. This will give you a list of rowIDs of the table you want.