What should I do if the taskbar button is missing and the close button is not displayed?

For computer users, you must be familiar with this task. Everyone is familiar. It is because they are too familiar. Sometimes there are some abnormal problems that will make us strange, such as task manager. Suddenly, there is no outer border, close, minimize, maximize button is gone, how can we get back lost buttons?

1, First of all, the task manager without the border button is like this

2, we double click in the blank space, as follows

3. After double-clicking, the button border is back again

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