The Question SuperUser reader MonkeyZeus wants to know how to stop Adobe Acrobat Reader DC’s sidebar from opening by default: In Adobe Acrobat Reader DC, does anyone know how to prevent the sidebar from opening by default? It is not so bad when a PDF is in portrait mode, but it takes up too much visual real-estate when opening a PDF in landscape mode. How do you stop Adobe Acrobat Reader DC’s sidebar from opening by default? The Answer SuperUser contributor Run5k has the answer for us: Newer versions of Adobe Acrobat Reader DC (currently at 15.023.20056) have changed both the wording and the function within Preferences.
Apr 21, 2018 I have a Macintosh and now seem to have Adobe Acrobat Reader DC in order to read my PDF files. I used to be able to select pages from my PDF files and drag and drop them into emails, but now I cannot. It stated I had to buy the program, so I did. But when I went to download it, it says Acrobat Reader DC is not available on a Mac.
![Acrobat Acrobat](/uploads/1/2/5/6/125634302/987054329.png)
Instead of deselecting the option to open the Tools Pane by default, the application will now remember whether it was previously shown or hidden. Before you make changes via Preferences, open Adobe Acrobat Reader DC, go to the Menu Bar, and navigate to View - Show/Hide - Tools Pane to hide it accordingly. Once that is done, return to the Menu Bar and navigate to Edit - Preferences. In the subsequent open window, highlight Documents in the upper-left corner and tick the box to Remember current state of Tools Pane, then click the OK Button. Have something to add to the explanation?
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A report by points out that Google's Android operating system had the questionable honor of being the software with the most security flaws in 2016. A total of Android operating system vulnerabilities were discovered last year, much more than the 319 found in runner-up Debian Linux. The third place was taken by Canonical's Ubuntu Linux with 278 security flaws, while the always-leaky Adobe Flash Player plug-in took the fourth spot with 266 bugs.
![Adobe Adobe](/uploads/1/2/5/6/125634302/895937180.jpg)
The fifth and sixth place is occupied by the Novell Leap and Opensuse operating systems, with 259 and 228 flaws, respectively. Adobe rounds out the top ten with Acrobat Reader DC, Acrobat DC and Acrobat DC, which saw 227, 227 and 224 flaws posted, respectively. Apple ranks 11th with 215 flaws in Mac OS X and Microsoft can't be found until place 13, with 172 flaws in Windows 10. These headline numbers do not tell the full story, though, it is the number of vulnerabilities by vendor tables that are really damning. Google does not top that list.
Adobe does with 1383 vulnerabilities across 50 products, while Microsoft is second with 1325 per 50. Apple makes the list with 324 vulnerabilities, but this is more than half the issues that affected it in 2015. Google meanwhile, is attributed with 698 issues across 50 products. Most of which probably relate to Android. While this is low in comparison to Adobe, it is more than double the amount reported in 2015, where Google was shamed 318 times.