Creo elements dircet modeling 19.0 problem

At the beginning of useing Creo elements dircet modeling 19.0 was working well.

But after a period of use, the Select (F2) command and preselect command cannot work, and the space function key is also disabled.

I don't know what the problem is.

Best answer by bjyuen

It's solved.

Viewport setting-->Selection-->Preselection mode

AuthorAnswer

12-Amethyst

It's solved.

Viewport setting-->Selection-->Preselection mode

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