How can i fix this?

[mestizo_89]

I made a screenshot for you to see better

Tuna Universitaria de Salamanca. Certamen de Tunas de Distrito: Novia del Mar. Santander.

[jcznk]

It looks like you are using this add-on Enhance main window - AnkiWeb
?

If so, the highlight color should be due to this setting:

Marked background color
The color of decks who have marked cards but none of its descendants are both ended and have marked cards.

which defaults to "marked background color": "powderblue".

You should be able to remove the background color entirely by changing the add-on’s configurations: Tools → Add-ons → Enhanced main window → configuration → set “do color marked” to false

[mestizo_89]

Thank you so much!!