Windows Remote Desktop: Apps from Host appear too small on Client

Client: Windows 11 25H2 Build 26200.7623
Host: Windows 10 22H2 Build 19045.6466

I've just set up Windows Remote Desktop between a host PC running Windows 10 and a client laptop running Windows 11 Pro.

The connection between the two computers seems to be working smoothly, but there's one problem: The apps from the host P.C. appear so tiny on the screen of the client laptop that they are unusable. But, oddly, not all apps appear tiny. For example the Firefox browser from the host PC appears on the client laptop full size. In fact, I'm typing this post in Firefox on the client laptop right now.

But other apps, like MS Word and Winamp appear in tiny windows, so tiny that I can't make out their controls or their text.

One further observation: I think those tiny apps may have appeared full size on the client laptop when I first established the Remote Desktop connection. But this Thinkpad laptop I'm using as the client has what is for me an unconventional touchpad button arrangement, so when my index finger reaches for a button that's not there and hits the touchpad instead it triggers all manner of unexpected mischief. So I myself may have inadvertently resized the display size of the apps as they appear on the client screen.

Any ideas on how to enlarge those tiny apps?

It is related to screen resolution. The RDC client display gives you the same resolution as the host. So, when I RDC into a host with a 1366x768, and display it on my 5120x1440 client screen, the window is pretty tiny.