Can't adjsut the volume after editing clips

Hi there,

I couldn’t find the answer in a quick google search so I’m asking here:

There are some clips that the volume adjustment function on them disappeared after I’ve done some editing; the blue squares are gone and there are just red boarders to the clips. The upper bar also changed and there is no volume function in it. So I don’t know how can I adjust the volume now (without adjusting the faders…)

I attached a print screen to illustrate the problem.

Many thanks in advance for your prompt reply,

Volume adjustment after a clip edit.png