A new update has started rolling out to Razer Phone. Weighing in at over 365MB, the update brings Portrait mode for the camera and the May Android security fixes.
A fix for the Android 8.1 multi-touch issue is included in the new firmware. After the update the Razer will lets you lock recent apps to avoid closing them accidentally with a swipe or through the Clear All button.
As is usually the case with OTA roll outs, it may take time for the update notification to pop up on your unit, so stay patient.