Quote
In PD18 there was a button in the preview window to toggle clip or entire video preview. Now it's page down, but seems like it reverts right back to clip. Is there somewhere to set this preference?
Yes, they changed that behavior and removed the toggle button. In pref > Editing you can set "Switch to movie mode automatically during playback". Otherwise, it's up the to the user with Page Up and Page Down keys to toggle.
Jeff