Software, browsers & email

Can't open more than one window of an app

When an app refuses to open a second window, it's usually because the app is designed to run as a single instance, or a setting or a stuck background process is blocking a new window. Checking the app's own settings first is quickest.

Difficulty
Easy
Time
5–10 minutes
DIY cost
$0

Symptoms

  • Clicking the app icon again just brings the existing window forward
  • No option to open a new window from the menu
  • App briefly flashes then does nothing when trying to open again
  • Works fine after a restart but recurs later

Likely causes

  • CommonApp is designed to run as a single instance by defaultMany apps intentionally only allow one window unless a specific new-window command is used.
  • CommonKeyboard shortcut for new window not being usedOpening a new window often requires a specific shortcut like Ctrl+N rather than relaunching the app.
  • PossibleStuck background process from a previous crashA leftover process can block the app from launching a fresh window.
  • Less commonSystem resource limits reachedExtremely low memory can occasionally prevent new windows from opening.

What to do

  1. Try the app's specific new-window keyboard shortcut, commonly Ctrl+N or Cmd+N.
  2. Check the app's File menu for a 'New Window' option.
  3. Close the app completely, including any background process in Task Manager or Activity Monitor, then reopen it.
  4. Restart the computer if the issue persists.
  5. Check the app's settings for any 'single instance' option that might be enabled.
  6. Update the app to its latest version.

Safety

Generally low risk

Generally low risk for a careful person. Stop if anything looks different from what this guide describes.

Related guides

Operator provides AI-generated troubleshooting information. It can be wrong. For safety-critical, electrical, gas, structural, medical, automotive safety, or other high-risk problems, consult a qualified professional.