The right column and bottom column are missing in IDEA

The right column and bottom column in IDEA are missing.
During development, the maven, database and other columns on the right side of IDEA are missing. There is
nothing in the right column and at the bottom.
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Solution to the problem:
View—>Appearance–>Tool Windows Bars, just select it.
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After selecting, it appears
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Origin blog.csdn.net/CSDN_Admin0/article/details/131697794