MATRIX Triple Output Adjustable Linear DC Power Supply 30V 3A 4 Digits Display with Series and Parallel Mode US Power Cable MPS-3003H-3

Can it deliver -25V and 25V by putting it in series mode, and connecting the two variable supplies? Can do this with common ground for +/-25v and 5v?

When using the supply in series, is the "+" terminal of the low supply automatically (internally) connected to the "-" terminal of the high side?

Can the user adjust the display brightness? The current display (red) is very bright. Voltage (green) is very dim, and hard to read.

For the manufacturer: Has the green display brightness issue (too dim) been resolved?