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Enable repeating group to order itself to show visible cells in a row and without leaving a blank space between repeating group rows

Hi everyone,

I have been stuck on this problem for quite a while, so any help would be greatly appreciated.

My website is a pinterest type platform that allows users to create topic boards on anything that they are interested in. Users are able to create tabs on categories within this topic (as seen by the buttons All, Test, Help, Repeat on the left). The plus button allows users to add new categories of their choosing.

This board creator can then add pins to this page, and classify it under a particular category. This allows users viewing the board to easily sort through information based on the category.
As you can see in the images, when All is selected, all boards show versus when Help is selected, all help-related pins show.

My problem is that the order is messy within the repeating group when sorting by category and all that happens is that pins are hidden and a blank space is left. Does anyone know how I could enable the repeating group to automatically sort itself to show only the visible pins in a row and therefore not leave any blank space? Thanks in advance!

Hey! Did you find an answer to this, currently stuck myself!