Re: Lost bookmarks in the side bar : my bookmarks sidebar is now empty,
Wondering in which browser (Safari, Firefox, Chrome etc.) it is, that you no longer see your bookmarks.
Eg: In Safari: The sidebar can be used for Tab Groups, Reading List or Bookmarks
Try scrolling down to see if you can click "Bookmarks" in the sidebar to reveal your bookmarks
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Re: I've lost my Google search bar on the homepage,
We can now just use the website address field ("Smart search field") to search as well as to go to websites
If needed: You may want to check your "Search" settings:
In the top menu-bar : choose Safari > Settings, then click Search.
More info for MacOS 26 Change Search settings in Safari on Mac - Apple Support
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Re: I think my 2019 MacBook Pro just underwent a Software Update.
You may have "automatic updates" turned on: (Major upgrades are now named for the year's date.)
- MacBook Pro (16-inch, 2019) is compatible with the latest MacOS 26 updates, now up to MacOS 26.1
If the update was the latest MacOS 26, MacOS 26.0.1 or MacOS 26.1 the guide below may prove useful.
Else: (earlier MacOS versions can be chosen at the top of "how to" articles reached from the "Table of Contents")
Resources for MacOS 26 Tahoe: Safari User Guide for Mac - Apple Support
and
Mac User Guide - Apple Support