I'm talking about [outline=#FFFFFF], with a lot of text sizes it can kinda make the text just unreadable because the white outline is too thick making the black part of the text too thin, is there a fix for this?
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You can try outline effects instead, but they don't work well with some fonts.
Or create a spritefont with the embedded outline:
construct.net/en/forum/game-development/tools-and-resources-27/sprite-font-generator-v3-64038
Use the lineThickness BBcode tag, e.g. [lineThickness=0.5][outline=blue]Text[/outline][/lineThickness] will adjust the outline thickness to half its usual size. All the supported BBcode tags are in the manual.
lineThickness
[lineThickness=0.5][outline=blue]Text[/outline][/lineThickness]