Hi Dana,
Thanks for contacting Syncfusion Support.
We can achieve your requirement (“increase the font size for the size in TreeView”) in TreeView component by overriding the CSS. Please refer to the below code example,
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[CSS]
<style>
/*Change the font-size for all nodes*/
.e-treeview .e-list-text {
font-size: 16px;
}
</style>
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Please let us know whether the provided sample is helpful in achieving your requirement. If not, revert with more information to provide an appropriate solution.
Regards,
Piramanayagam R