BlurBox
Help · How-to

Glue a BlurBox to a window

Make an overlay follow a window as you move and resize it.

Last updated: April 2026

A free-floating BlurBox stays at a fixed position on your screen. That's fine for static layouts, but most of the time you want the overlay to follow the window underneath— so when you reposition Mail or Chrome, the overlay tracks along. That's what gluing does.

Glue an overlay

  1. Position the overlay over the area you want to hideFor example, drag it onto the recipient field in a Mail compose window, or over a financial dashboard in your browser.
    A BlurBox positioned over a sensitive area in another app
  2. Right-click the overlayA context menu appears with options for the overlay.
    Right-click context menu showing 'Glue to Window Underneath'
  3. Choose “Glue to Window Underneath”The overlay locks in place and starts tracking the window beneath it. Right-clicking again will now show “Unglue” instead.
    A BlurBox glued and locked to a window

Test it

Drag the underlying window around. The BlurBox should follow immediately. Resize the window — the overlay stays attached to the same area you originally placed it over.

Many overlays per windowYou can glue several BlurBoxes to the same window. Each one tracks independently, so you can hide multiple sensitive areas at once.

Unglue an overlay

  1. Right-click the glued overlay
  2. Choose “Unglue”The overlay returns to free-floating mode. You can drag it anywhere or delete it.

Common problems

If gluing isn't working as expected, check the most common causes: