problem in viewport

i have a problem in viewport in Orthographic view show like this image and in other viewports when i zoom or moving model disapper to return it need choose the front or roght ,top views to apper again,Thank you.

this is I think your Graphic Card Problem

Your Graphic Card Model????

Are you Using Laptop or Desktop ???

This often happens when your system units are too big/small for the size of scene you're working on.

If you're working on small scale items then consider having your system units as mm, if you're working on large scenes (like the majority of arch vis) then have it set to meters. This does not affect your display units.

Thank you for replay i try to make change insystem units but the problem didnt solve yet

You'll likely need to start a new file with the correct units, then merge the old stuff in.

check once your viewport clipping option.

This often happens when your system units are too big/small for the size of scene you're working on.

 

If you're working on small scale items then consider having your system units as mm, if you're working on large scenes (like the majority of arch vis) then have it set to meters. This does not affect your display units.

Ditto with this. Also 'just chnging the scale' won't solve your problem, you need to understand first how scale system works.

Also be sure your geometry is close to 0,0,0 and nothing else is floating around your scene.