Everything does not save closed tabs to the session.
I will look into adding support to do this.
Currently, once the window is closed and you exit Everything, the windows are lost.
For now, instead of closing the window, exit Everything from clicking the File menu, then clicking Exit.
Sessions are not automatically restored.
To restore the previous session:
- From the History menu, click Restore Previous Session.
To automatically restore the previous windows and tabs when creating a new window:
- In Everything 1.5, from the Tools menu, click Options.
- Click the Advanced tab on the left.
- To the right of Show settings containing, search for:
restore
- Select: session_store_restore_on_new_window
- Set the value to: true
- Click OK.
Restore Previous Session don't work (1.5.1376a)

.
What happens?
Is the option grayed out?
Did Everything create a Sessions-1.5a.json in %APPDATA%\Everything ?