Without more info it could be one of two things:
setting: Editor: Selection Highlight
disable that or
change its color via:
"workbench.colorCustomizations": {
"editor.selectionHighlightBackground": "#f000",
}
The last digit in that hex is opacity.
or they could be find matches in which case you will have to do:
"workbench.colorCustomizations": {
"editor.findMatchHighlightBackground": "#0000"
}
The hexes can also be "#ff000000"
eight characters - last two being opacity.
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