For situations where a large number of bookmarks are utilized and grouped into function/site/etc... folders, being able to have just the relevant folder expanded would be a welcome convenience.
There is a recommendation that a switch be provisioned to enable/disable the feature as required as well, to accommodate those not requiring and/or perhaps finding the feature confusing.
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Can you go into more detail please I don't understand what you're asking for.
What I understood was that you want an open all bookmarks in folder button but I think that's already a feature so it must be something else.