SportsPress plugin allows you to highlight a team in the league table. Usually, it is done in order to show and quickly find a home team in the table.
By default, none of the teams is highlighted after demo data installation. To highlight a team, you should edit a league table. Navigate to Clubs > League tables and select the table you want to adjust:

You’ll see radio buttons next to each team, you should click the button next to the team you want to highlight:

Click the “Update” button in order to save the changes. Now you can see the changes on the league table – the selected team will be highlighted with a light grey color which is inherited from the theme color scheme.

You can remove it by clicking the radio button twice if you do not want any team to be highlighted.