I changed a setting somewhere and now have a split screen when I am in my email, help.
My email can only be viewed in a split screen with another page sharing the screen. I don't know how to change the setting back so the email fills the entire monitor. No other site is shared with any other site.
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Did you use a bookmark to open the page on the left?
Opening in the sidebar is the default for bookmarks that are created via a link or button on a website.
You can check the Properties of a bookmark via the right-click context menu in the sidebar (Ctrl+B; Command+B on Mac).
In the Bookmarks Manager (Bookmarks > Show All Bookmarks) you can click the More button in the Details pane at the bottom right.
Make sure that "Load this bookmark in the sidebar" is not selected.