Please Help - Cannot set the audio volume of line in input

Hi all. On my Black magic 4k, with last last software istalled (but the problem was also with the older one) I cannot slide and set up any type of volume level when set on line imput. The problem is present in any condition, mono, right or left, both mono and so on...
Please Help !!

When set to LINE input the camera has fixed gain to support maximum +24 dBu.
So no LINE volume level you can change in camera, it is locked at 50%.
Adjust the output level of your audio LINE source accordingly.

What are you trying to feed into the audio inputs of the camera?

Thank for your reply. I enter from the out of rode wireless go attached to a rode lavalier. I've to reach usable volume ones in davinci gaining the audio track at the +26 db and than apply a compressor gain in fairlight. That is the only one solution.
Correct?

Thank for your reply. I enter from the out of rode wireless go attached to a rode lavalier. I've to reach usable volume ones in davinci gaining the audio track at the +26 db and than apply a compressor gain in fairlight. That is the only one solution.
Correct?

Then you should set your input to MIC levels, not LINE levels - those are meant for the output from mixing consoles and audio mixers.