How to add midpoint grips to rectangular viewports?

[Chamlies]

Some of my viewports have grips only at their corners while others have them at side midpoints as well.  How do I add them, or what setting will reveal them, on all viewports?

Thx

[pendean]

@Chamlies Let's try this explanation

This is an AutoCAD default viewport using MVIEW command

This (these) is a viewport created with a closed PLINE using the OBJECT option in MVIEW command

If you always want to use the latter, you have to consciously and proactively only use the latter for viewport creation.

Is that what you are asking for?

[cadffm]

Mview option Object, if you have an object with the shapeyou want

or option Polygon, to draw an irregular new viewport

See also  command VPCLIP [F1] to clip existing viewports

[Chamlies]

I've actually been using the Layout tab, which appears to execute -VPORTS ...

[pendean · Accepted solution]

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@Chamlies wrote:

...I've actually been using the Layout tab, which appears to execute -VPORTS ...

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Same results as MVIEW's default, and same solution needed there too (Object sub-selection instead) to get what you desire ultimately.

Looks like you are ready to customize your own button to do the latter instead of the default former (with whichever command you want). Do you need help? Or can you dive in with this CUI customization overview https://www.cad-notes.com/exploring-autocad-cui-creating-a-command-part-2/ 

[Chamlies]

Thanks.  I will look into customizing the button.