I routinely untick "Enable battery monitor" because the batteries we use always have an internal BMS which provides SoC et al.
I noted today during a commissioning that the size (Ah) of the battery in the ESS configuration is tied to whether the battery monitor is enabled or not on the General tab.
With "Enable battery monitor" ticked:
With "Enable battery monitor" unticked (note also the two mentions of battery capacity differ 10Ah vs 0Ah):