MMVARI setting "WaterFall Call - dont change frequency" - what does it do?
In advanced view window - decoded calls from rx channels and cluster digital calls are displayed at waterfall or spectrum
And they are  clickable.

In one cases comfortably change only tone frequency at waterfall, in other cases more comfortably change TRX frequency so that tone frequncy not changed. For example, in fsk mode.

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^   ^   ^
| Waterfall AGC  |   |
| RX Width  |   |
| UOS (for RTTY)  |   |
| Display View  |   |
| FFT Scale  |   |
| NOISE Reduction  |   |
| Waterfall Speed |   |
| Sound playback  |   |
| Add CR/LF at start  |   |
| Add CR/LF at end  |   |
| Show CAT frequency  |   |
| Show Decoded Calls  |   |
| AutoSpot Calls from Channels  |   |
| WaterFall Call - don't change frequency  | In Advanced View decoded calls from rx channels and cluster spot calls are displayed in the waterfall display. They can be clicked. Clicking a call either changes the tone frequency of the waterfall detected or it changes changes the TRX frequency so that the signal received has always the same tone frequency. This is usefull in fsk mode.  |
| Modes  |   |
| Autograb Callsign  |   |
| AutoGrab Number  |   |
| AutoAnswer Grabbed Calls  |   |
| Automatically Answer Next  |   |
| Standard View  |   |
| Advanced View  |   |
| Advanced Settings  |   |