NetBeans split the editor window /open file in new window /open one file in two tabs

A. To open one file in two tabs

1.  Double click the file or right-click the file and select Open to open the file in the editor window. 
2.  Right-click the tab title and select Clone or click Window in the top menu, select "Configure Window", then select "Clone Document".

B. To Open one file in two windows, do one of the followings

1. Right-click the title of the tab that has the file open, select Split, and then choose how you would like to split the file, vertically or horizontally.
2. Click Window in the top menu, select "Configure Window", then select "Split Document" and finally choose how your would like to split the file.

      To close one of the windows, repeat one of the above two procedures and at the last step select Clear.

C. To open a file in a new editor window

1. Drag the title of the tab that has the file open to the bottom of the editor window until you see a rectangle and drop it. To close the window, right-click on the tab title and select "Collapse Document Tab Group".
2. Right-click the title of the tab that has this document open, select "New Document Tab Group". To close the window, right-click on the tab title and select "Collapse Document Tab Group".
3. Click Window in the top menu, select "Configure Window", then select "New Document Tab Group". To close the new window, select "Collapse Document Tab Group"            

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