How to view more than 11 columns in grid view

Hi,
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?