It's the WiiM Home app (WHA) that displays your home shares, it's nothing to do with the endpoints (mini/pro), they're just targets for the audio, so if there's no setting in the app (which I don't believe there is) then it's not possible.
The home shares browsing (UPnP control point) in the WHA is very basic, you're better off with another control point like BubbleUPnP/Hi-Fi Cast/mconnect e.t.c. However, I've literally just noticed that if you're using a third-party app the WiiM doesn't appear to be gapless, at the moment!