I have a 2017 12-inch Galaxy Book with 4GB of RAM and 128GB of storage. I want to use it mainly as a tablet for streaming and looking at websites.
Fedora KDE Plasma Mobile didn't feel quite like the Android-style tablet interface I was hoping for. Debian Xfce is installed now, but I'd like something more touch-friendly. Any suggestions?
Try Fedora Workstation with GNOME. It has a more touch-oriented feel than a traditional desktop, with gestures and an interface that doesn't rely on a persistent taskbar.
It may feel more like a tablet-capable desktop than Android, though. Test it on the Galaxy Book before settling on it, especially touch, screen rotation and the on-screen keyboard. Support for those features can depend on the hardware.
If the goal is something close to Android, Plasma Mobile is probably closer in layout than GNOME. GNOME feels more like a desktop that has been adapted for tablet use, so it might not solve the part you disliked.
Another option is regular KDE Plasma with the full-screen application menu. It won't turn the machine into an Android tablet, but it gives you a touch-friendly way to launch apps while keeping a conventional desktop available when you attach the keyboard.
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ordinary.tuesday.math:
I was worried Fedora might be too heavy for the hardware, but GNOME sounds worth trying. I'm already somewhat familiar with Fedora.