This is a problem caused by the default tab position after the serial number 1 is increased to 2 digits; Simply select Paragraph-Tab from the right-click menu, then select Left Alignment in the default tab and select 0.25 characters in the default tab. The following is a detailed introduction:

1. Select the reference with spaces, right-click the paragraph, select the tab stop in the lower left corner, and then select the space character with the same size as the non-indented document as the default tab;

2. For the alignment mode, select the left alignment option. The default tab stop can be adjusted by the up and down buttons, or directly entered in the input box. The recommended setting is 0.25 characters.