If you have the balance harness connected, it will be a balance charge by default.

If you don't connect the harness, it will warn you, and require another button push to charge without balancing.

As far as balance only, that's a good question, as it is almost always a mistake to only balance a lipo. Maybe for an attempt to recover messed up packs that won't balance charge correctly?

Bottom line, just balance charge and run. The manual even recommends promptly removing the lipo at the end of charge so no unnecessary balancing happens.