The cloud mask function helps keep the biomass view clear when probable cloud cover is getting in the way. Sometimes partial cloud cover in the sky can still show up as low vegetation density in the biomass view, so adjust the cloud mask if you think you can see cloud cover showing up.
To adjust cloud mask -
Click on the 'Imagery' icon in the sidebar on the left.
Scroll down until you see 'Show advanced settings'.
Click 'Show Advanced Settings' to find the cloud mask controls.
We set your default cloud mask to 0.1 but you can drag the slider or use the + / - buttons to adjust the value between 0 and 0.5 in increments of 0.01.