How do I show the selected items in an easier manner in this dropdown

I have a dropdown with checkboxes as items. HERE is the working example

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I let people select multiple options from this after they search for it One problem I notice is that it is not immediately obvious which items have been selected. enter image description here

  1. Should I add a button that says show selected, how does filtering work with that?
  2. Should I add a checkbox saying show selected, what happens during filtering?
  3. Should I add tags below this searchbox where each tag has a delete button and shows the selected item?
  4. Here is another way to rephrase the question, what is the easiest way the user will see their selected options in this?

Some guidance is super appreciated

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