Try installing the Radeon Adrenaline Driver instead of the Enterprise driver and see if it makes a difference: Workstation .
Radeon™ Pro Software Adrenalin Edition 473 MB 18.7.1 7/10/2018 *DOWNLOAD Description:
The latest Radeon™ Pro Software Adrenalin Edition.
When you install the above software you need to activate or install the "DRIVER OPTIONS" from that software so that you will be able to switch from professional to gaming mode. This is the DRIVER OPTIONS GUIDE: https://www2.ati.com/relnotes/driver-options-user-guide.pdf
Copied from Guide:
The “Driver Options” feature will allow your professional workstation system to switch between professional mode and gaming mode. Your system can support up to two gaming drivers (Radeon™ Software for Radeon™ Pro drivers) and one professional driver (Radeon Pro Software) with a Microsoft Windows® 10 system configuration.