Hi @Hưng Tạ quang,
To change the keyboard shortcut of add or remove Paragraph Spacing back to "Ctrl+0", you need to:
- Go to File > Options > Customize Ribbon.
- At the bottom of the Customize the Ribbon and keyboard shortcuts pane, select Customize.
- Find OpenOrCloseUpPara in the All Commands category. In the Press new shortcut key box, press Ctrl+0.
- Select Assign.
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