Editor doesn't open

When you click on a mesh, or an animation normally the editor is opening, but when I click on a mesh or an animation just a white window opens. I let it run for a few minutes but nothing happens. What can do?

Is it with every mesh and animation? and does it still happen with a fresh project or just in a specific project?

It happens with every mesh, animation, blueprint,… . I tried to open an other project, but nothing happened.

Can you insert a screenshot?

This is the white screen.

Can you show the log information in “Saved\Logs\LowPoly_OpenWorld.log” after open an editor for a mesh?

So is it just the preview window which is showing white?

I just solved my problem I forgot to maximize the window, but thank all of you for your quick answers.