I was asking myself the same thing for a few hours this morning. From the research I did, I believe it is not an issue with EKOS, but with Synscan. I dont believe it can be adjusted.
From EKOS you can adjust the slew speed (as well as from your SynScan controller) so the only alternative I see for now is to slew manually to the position you want to go (ie: arrow buttons or joystick) and if required, do the fine-tuning with GoTo.
Hope I am wrong and there is a better way, but I doubt it.
OS: Astroberry on Raspberry Pi 4 4GB
Mounts: EQ6R-Pro, StarAdventurer
Imaging: SW Evostar 80ED & SW 200PDS, ZWO ASI 1600MM-PRO
Guiding: SvBony 60mm, ZWO ASI 120MCS
Accesories: ZWO EFW, ZWO EAF, Pegasus PPBA