This is the current bug with driver switching that Paul mentioned. It was introduced with the most recent app updates. You can still swap drivers using an older version of the app, or by using the CLI (which isn’t tough and is good to set up since it’s pretty useful, but is a bit on the technical side). Otherwise, we’re just waiting for ST to fix it.
You shouldn’t need to worry about memory. I haven’t seen anyone complain about a V2 running out of space, and you’re not running that many devices.
Start by checking the old IDE. Most of your stuff should still show the fingerprint there if it’s still using a Groovy DTH or was installed using one and then automatically migrated. Anything installed directly to an Edge driver won’t show there though, so you’ll need to either use the CLI or one of the browser-based community-created device viewers.
CLI (instructions are to get logging going, but the basic setup is the same regardless of what you want to do).