What's the best placement for "select all" option in multiple filer component?

Question

While researching I found two main ways of placing the "Select all" option. One usually appears in the top right corner and another one (used i.e. by Microsoft it seems) is adding a Select all option on top of all filtering options. What's the difference from the user perspective and which one is the best practice?

Answer 1

Select all checkbox

• More common, more modern IMO
• Also gives the user the information if only some checkboxes are checked or all (indeterminate state vs checked state)
• My choice usually

Just make sure it stands out more from the other checkboxes (e.g. line below, different background)