How to filter in like with lnav?

[piotr-dobrogost]

How can I filter in lines containing some string (show only lines containing the string) like with lnav.org?
I thought putting the string in Unless expression and setting Action to REMOVE would do the trick but it does nothing.

[krasa]

Excluding all but FSRecords:

or

filtering all but Action

• whole line must be turned on

[piotr-dobrogost]

Thanks for the answer.
Both variants do what I was looking for.
Not sure how do they differ (if at all)?
By the way, after going to Open Grep Console settings and changing settings, the new settings do not take effect until after I try searching for something using box in the upper right corner:

which is not intuitive.

[krasa]

new settings do not take effect

it's just that the console does not get reloaded. It is not feasible to do that.

Maybe Grep would be more suitable

[piotr-dobrogost]

Grep looks good, thanks for bringing my attention to it.