How to disable the grey background colour on iterm2 desactived tab split?

In iterm2, by default setting, only the current using tab split will have the normal black background colour, meanwhile all the other tab splits will be covered by a fog-like grey background colour.

I know this may be designed to improving concentration. The problem is, sometimes I really need to view two splits at the same time. And this fog-like grey background colour has increased the difficulty of reading.

Is there some way to disable this feature?

Thank god, I found it by myself.

Click the iterm button on the top bar, select Preferences, then click Appearance icon, on the right part of the panel, Under the Dimming options, there is a Dim inactive split panes option, you cancel the default selected status, done!