

I thought I already replied to this, but apparently not. Sorry for the late response.
The start menu no longer has the windows 10 tiles. It’s just search and icons of apps you’ve pinned. Similar to phone app menu. You can put some into folders/groups together. And that’s it. There’s no further customization possible.
You can get third party solution to bring back more features such as Start11 from Stardock, but that means paying for an additional software and I’ve heard it gets buggy with windows updates.
The backflow current from fans is extremely minuscule and extremely unlikely to damage anything from that. There are even tests using a damn leaf blower on the fans and it barely generated any current. Even if it did generate a backflow, diodes on the mobo should prevent it from becoming an issue unless it’s a power so great that it just fries everything, but that’s basically impossible with a fan.
Here’s one such experiment.
https://youtu.be/k9KA-xLLQXo