I guess you mean the "Rain Totals" page in WS View Plus.
It is set - in your gateway (GW1x00, GW2000 etc.) to whatever you set it.

If it is set (by you or by factory delivery default) to "traditional", you can calibrate the traditional rain gauge, provided one is connected (WS69, WS40)
if it is set to "piezo", you can calibrate the WS90 rain tiers. (same inside the HP25x0 consoles)
Whichever priority is set, the ecowitt.net dashboard displays both if both are connected (as does WSView Plus on the "Live Data" page).
One as "Rain[fall]" (default name) and one as "Piezo" (default name).
Maybe in the default tile sequence, the traditional tile comes first when traditional is selected (but you can change your tile sequence).
If your HP25x0/HP350x console has "traditional" selected, only the traditional rain gauge data is displayed on the screen and sent to the ecowitt.net dashboard.
But you have to be careful depending on your needs - if e.g. you want to get the wind or solar readings of the WS69 or WS80 and the rain readings of the WS90, that's not possible - the WS90 has highest wind, rain, solar reading priority. Then you need two consoles/gateways.
The settings are identical in the WebUI under "Rain Totals" (for those consoles which have a WebUI beyond WiFi setup)