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May be possible hide the in-band-canvas if "Frequency scale offset (kHz)" on Config tab not equal 0?
I think it's not so difficult and site looks more correctly if you use frequency converter.
Beginning with v1.436 the band identifiers will not be displayed if their frequency is less than the frequency scale offset. But the remaining empty white space is not reclaimed because right now that is difficult to do (for historical reasons). It will have to wait for a major rewrite of that part of the code.