How do I get the width of the N Properties Panel in the 3D View using the Python API of Blender 2.8?

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1 Answer 1



The screen is made up of areas, each area has an x, y, width, height attribute.

Python console test code:

>>> for a in C.screen.areas:
...     a.type, a.width
('CONSOLE', 931)
('VIEW_3D', 346)
('TEXT_EDITOR', 931)


within each area there are regions. Commonly there are 'HEADER', 'UI', 'TOOLS' and 'WINDOW' regions. For the 'VIEW_3D' region the N panel is region type 'UI'

>>> for a in C.screen.areas:
...     if a.type == 'VIEW_3D':
...         break
>>> a.type

>>> for r in a.regions:
...     r.type, r.width
('HEADER', 931)
('TOOLS', 1)
('UI', 335)
('WINDOW', 931)

If you are writing UI code to go in the N panel then can get the width directly with



Is there a way to determine the left 3D view sidebar's current width with python?

  • $\begingroup$ I would never have thought that this panel is called 'UI'. Thank. $\endgroup$ Commented Mar 24, 2019 at 13:53

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