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Usually this problem is when the SDA is pinned on the lower control bar. Try one of the following solutions:
Hover the mouse over the SDA icon symbol
Tap the alt key and space key at the same time to open the java pane
Select maximize.
Or:
Launch Sierra.
Once the application is active on the taskbar, hover over the icon until the square thumbnail display shows up.
Right-click on the thumbnail.
Choose maximize.
Verified:
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