Can I control soundbar volume while controlling TV/box?

Yes, this feature is supported. You can:

Keep your remote set to control Device A (e.g., TV)

While simultaneously using specific buttons to control:
• Device B’s volume (e.g., soundbar)
• Device C’s channels or other commands

This eliminates the need to constantly switch between devices.

Example:
When watching TV, you can reprogram your TV’s volume buttons to control your speaker’s volume instead.
Here are the steps: 
Select your TV device –>> Choose “Remote Keys” –>> Tap the Volume button –>> Select “Reassign Remote Key” –>> Switch to your speaker device –>> Find and select the volume command –>> Click “Done” in the upper-right corner