I'm very new to SharePoint and have a stupidly high level of access to a site built for our team (dangerous!). Apologies if this is a duplicate question however I haven't been able to find a resolution so far which is probably because no one was stupid enough to make the same mistake. Here goes:
On the list settings page I clicked "Add from existing site columns" to try and add a column that is available on other site libraries/pages. Unfortunately the column names were too long to show up in the little 'Available site columns' box you see below and there were multiple that started out the same so I added the whole lot to the 'columns to add' box on the right thinking I could just put them back afterwards.
Nope. I now can't figure out how to remove those columns I've added without completely deleting them from existence according to the error messages and they're cropping up in forms on other pages and affecting columns that I believe were calculated columns.
Anyone have any suggestions? I hope the explanation made sense, happy to provide more info if necessary. Would rather fix this myself then go crawling back to the dev team.