Shown progress bar steals focus. That might happen several times depending on what is being done. For example when importing a large project a progress bar will be shown on asset imports and different types of compilations. That makes working with running machine inconvenient while some project is imported.

Steps to reproduce:
1. Open a larger project
2. Click to reimport all assets
3. Once Unity splash screen is shown, switch to other applications window. As an example, switch to notepad and start writing a letter containing positive thoughts
4. Focus will be grabbed by unity project import progressbar. Several times, even, if you switch back to previous window. This will make expressing positive thoughts very hard.