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I’m assuming This is bootstrap-vue.
When creating the b-table you can pass the style object in thStyle property.
You can force the headers to be of normal style with text-transform: none;.
Read the documentation here: Bootstrap vue – b-table
Refer the "Field definition reference" section
Since this is not pure vue, make sure to add the proper tags so that you can reach a more relevant audience.
Source:stackexchange.com