How to view more than 11 columns in grid view

We need to make view of grid view shows more than 11 columns so we edited in grid.js as follows:

But still not working as shown below:

any help?

I had a similar issue a while back, but seemed to work fine after a reboot. This suggests that there is a ‘reload’ function somewhere.

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Yes it works now after bench build but it isn,t work proberly

how to fix that?