Always back up your catalog before trying to downgrade.
The 10.4.0 update focused on stability and expanding hardware support, though it included several quality-of-life improvements for Power users: Adobe Photoshop Lightroom Classic 2021 v10.4.0
AdobeRGB or ProPhoto RGB (Captures a wider gamut of printable colors) Resolution: 300 pixels per inch (PPI) Always back up your catalog before trying to downgrade