How to know which tab i will convert to merchant tab ?

I already converted 5 tab to merchant tab before league so i was not worried about them beeing used or not but now that we are in league and some of my tab have stuff in them in worried that if i convert a tab to merchant tab it will void the item contained in it.

How do i know which tab will be converted ?

Ok nothing to worry about i noticed the text explaining it :
Items that were previously stored in an upgraded tab will remain in a remove-only version of the original Premium Stash Tab.

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