The VM-3P75CT is configured over VictronConnect and has an internal setting for the meter position. Therefore it doesn't support the position setting in the GUI.
At the moment a position setting does appear in gui-v2, but it doesn't actually do anything.
In gui-v1 the position setting is conditional depending on the availability of allowed roles on dbus, see here.
The VM-3P75CT is configured over VictronConnect and has an internal setting for the meter position. Therefore it doesn't support the position setting in the GUI.
At the moment a position setting does appear in gui-v2, but it doesn't actually do anything.
In gui-v1 the position setting is conditional depending on the availability of allowed roles on dbus, see here.
Seems to be related to https://github.com/victronenergy/gui-v2/issues/1178