Cannot change resolution on remote PC

Hello, I have a PC (win 10) connected to the internet only (no screens or peripherals) and when I connect to the PC from my two laptops, the resolution is stuck to 1024 x 768. Both laptops have native 1080p resolution and when I change it via the settings in Windows (on the remote PC) it just stays to 1024 x 768 and never changes to my choice. If I RDP (remote desktop) directly to the PC, the resolution adjusts itself to 1080p. Only in Splashtop the resolution is stuck to 1024 x 768. Tried to force it to 1080p or client native resolution in the settings but no change.

Any options?