We are aware of an issue that causes the screensaver to kick in, even when Serato DJ Pro is currently running, and in focus.
macOS 10.14 Mojave and 10.15 Catilina require the user to enable accessibility access for Serato DJ Pro, to allow Serato DJ Pro to stop your screensaver from activating, while in focus.
On prior versions of macOS, such access was not required.
You may be prompted by macOS 10.14 and macOS 10.15 when first launching Serato DJ Pro 2.0.5 (may require your Serato hardware to be connected), with the following messaging or a similar one that asks you to 'Allow' accessibility for Serato DJ Pro:
You can also manually adjust your settings to rectify permission (you will need to 'click the lock to make changes' and enter your log-in details to adjust the settings below):
System Preferences → Security & Privacy → Privacy → Accessibility → Serato DJ Pro → (enabled)