1. First, the user needs to open the DevC software on the computer, go to the page and click File Options, and then click New Options and Source Options in the pop-up tab.

2. Then enter the editing page of the source code, and you can see the display size of the code.

3. Secondly, users can zoom in as needed. Click Tools Options in the menu bar to open a drop-down tab where users can select editor options.

4. In the editor properties window that opens, the user switches the tab to the display tab.

5. Finally, click the up arrow in the font size option to make the font bigger, and then press OK.