This conversation has been merged. Please reference the main conversation: Photoshop 20.0.1: Most functions in Edit, Image, Layer, Select and Filter grayed out for image opened from Lightroom Classic
My OS: Win10 Pro 1809
Solved by deleting CC2019 (ver 20.0.1) and installing CC2018 (ver 19.1.7). Photoshop CC2018 is stable.