Troubleshooting a Dripping Flush Cistern: Need Help Adjusting Two Knobs?

Hello,

The problem is with a flush cistern. It gently drips - you can hear a slight splash of water and you can see the gentle movement of the glass - you can also see it with a characteristic stone rim. The device is basically new, in a bought apartment after renovation. I took off the switch and it looks like it's attached.
2 knobs? Although I do not know if they are even knobs. Is there something to adjust or without specs? Because if the usual cistern can be adjusted, I know everything here buried ...

Hello. You need to dismantle the drain valve to find out what the state of the gaskets possibly replace is certainly a manufacturer of this concealed kit. Make sure that the filling valve 100% closes the water supply. On the plastic lid covering the rectangular large hole should be relevant assembly information. I will not say how to disassemble, for example, the trigger valve because you did not write anything about the manufacturer, the name of the set, type, model

Added after 5 [minutes]:

Hello. You need to dismantle the drain valve to find out what the state of the gaskets possibly replace is certainly a manufacturer of this concealed kit. Make sure that the filling valve 100% closes the water supply. On the plastic lid covering the rectangular large hole should be relevant assembly information. I will not tell you how to disassemble, for example, the trigger valve because you did not write anything about the manufacturer, the name of the set, type, model.
Unscrew the 4 screws holding the front panel, and these two elements are the push rods to choose the amount of water

These two elements are pushers, I know, I meant the round one with the arrow pointing up.

The button was written Cersanit, while the sticker on the photo shows the model SP0-340 which would suggest KKPol by. Google.