Not having CINELERRA-GG a CMS, it becomes essential to have a monitor calibrated and set in sRGB that is just the output displayed on the timeline of the program. You have these cases:

Timeline Display Description
sRGB sRGB we get a correct color reproduction
sRGB Rec.709 we get slightly dark colors, because gamma
sRGB DCI-P3 we get over-saturated dark colors, because gamma and bigger gamut

The CINELERRA-GG Community, 2021