Hello,
About
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Oracle SQL Developer 4.1.3.20
Version 4.1.3.20
Build MAIN-20.78
IDE Version: 12.2.1.0.42.151001.0541
Product ID: oracle.sqldeveloper
Product Version: 12.2.0.20.78
Version
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Component Version
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Oracle IDE 4.1.3.20.78
Java(TM) Platform 1.8.0_60
Versioning Support 4.1.3.20.78
Issue 1

I dont use the Shift+F4 because it does not show me the DDL. I use the schema browser very often. After filtering for schema and table this is what I get sometimes on right click. This happens only sometimes and am unable to reproduce it. This time I captured it while it occurred. As seen in the picture this is not what right clicks always normally look like. When this happens the right click behaves like as if it was designed for touch screen and many options of the right click go missing. Not that it happens all the time. But want to know if I am doing something wrong.
Issue 2

I created the above image in mspaint to explain the problem. I am not able to reproduce it. I use Window+Right arrow and Window+Left arrow very often on SQL developer. Few of the times that I use this, I am unable to copy the contents of "Script output" subwindow/pane/tab becuase the "script output"(with all those buttons) kind of goes down while copying the contents of what users were dropped or what tablespaces were altered. The buttons are where they are supposed to be, so I can press the "clear script output" button or the "pin" script output button only where I should be able to. The below two "Script Outputs" are just painted on the SQL developer "script output" , the buttons are not pressable .
Is my narration of the problem understandable?
Am I doing something wrong here?
Many thanks
Copied manually from Float worksheet and get SQL popup from query result
Thank you very much for your patience and support.