You can reset to default color scheme in the Window>Preferences options page. This expample will be for resetting a theme usd for Java.
Navagate to Windows>Preferences>Java>Editor. Click on Syntax Coloring. Click "Restore Defaults" and "Apply". Then, navagate to General>Editors. Click on Text Editors. Click on "Restore Defaults" and "Apply".
I had the same issue and the above steps cleared up my problem. Also, the Show line numbers check box is on the last page from above
导入epf文件后,不满界面色调,可籍以上操作恢复默认主题。