I have a pop-up menu on the left side of the screen. How do I turn that off
I would say your TV is in store/demo mode. Some people have said they've found a setting buried somewhere in the Settings menus to turn it off, but it usually requires a factory reset. After it resets there should be the option to set it up for home use.
How do I factory reset my Roku® streaming device? | Official Roku Support
What's in this menu? If it looks like it's advertising your TV's features, then your TV was probably set up for store/demo mode. If has things like picture and audio settings then it's brought up by pressing * on your remote.
If it doesn't look like either of those, a picture would help.
I would say your TV is in store/demo mode. Some people have said they've found a setting buried somewhere in the Settings menus to turn it off, but it usually requires a factory reset. After it resets there should be the option to set it up for home use.
How do I factory reset my Roku® streaming device? | Official Roku Support