Method 1: Press the shortcut key shift+- (minus sign) where you need to underline. The more times the shortcut key is pressed, the longer the horizontal line will be.

Method 2: Click the underline in the start menu or press the shortcut key Ctrl+- (minus sign), and then press the space bar on the keyboard. The more spaces you press, the longer the horizontal line.

Method 3: This method prints horizontal lines through tables. The specific steps are as follows: Under the Insert option in the menu bar, click the table and select Insert 1× 1 (one row and one column). To complete the insertion, under the Table Design option, click the border, and then click the border and shading. Cancel all borders except the top or bottom border. Take the following border as an example. Click OK to print the horizontal line successfully.

Method 4: This method prints the horizontal line through the tab stop. The specific steps are as follows: right-click the document and click the paragraph. On the paragraph page, open the tab stop. Then set the tab stop position, default tab stop and alignment according to actual needs, select 4 as the reference line, and click OK. Go back to the document interface, press the tab key where you want to strike a horizontal line, and the horizontal line will be hit successfully.

Method 5: Press 3- (minus sign) at the position where the horizontal line is to be typed, and then press Enter, and the horizontal line will be typed successfully. This method can't change the length of the horizontal line, and the typed position is the length of the editable position.