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You can only do a manual sort when you are working within either a single folder or a single collection. So, if you want to sort images manually that are across a range of folders (or collections) you first need to put them into a single collection, then sort.
Lightroom refers …

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Stacking is a folder specific function.
If you are within a collection, a metadata grouping, keyword grouping, etc., then the stacking options will be grayed out.
A quick way to jump to the folder of an already selected image is to expand the Metadata panel and click the right-facing folder arrow.