Duran

It's a known issue. The thing that you want to do is not directly possible within the firmware on the Deye. You need to a third-party automation assistant that can change the work mode depending on the time of day. Don't know which one though.
Alternatively, a workaround stick to the daytime mode (un-tick Limit-to-Load), and on the Time-of-use screen, you can set Power limit value to something low like 300-350W. Any demand in excess of that value will come from the grid.
But you ideally should get at least one more battery to help make better use of the generation potential of your panels.

I am not at my inverter to check but try reducing the EXPORT LIMITER from 5000W to a much lower value and check if it doesn't reduce the power used for non essentials after sunset from the battery.
Also start with high SOC settings early in the evening and reduce the SOC as the hours tick on during the night. Have grid use ticked to keep the battery at the set level.