Hello,
You could add css style to make the text center, below is my demo code for you:
<style type="text/css">
.ms-vb2{
text-align:center
}
</style>
Here is a similar issue for your reference: https://social.technet.microsoft.com/Forums/sharepoint/en-US/21b5da68-1ed9-469b-bc1b-371057af1a07/sharepoint-online-how-to-center-the-text-of-a-specific-column-of-the-list-view?forum=SP2016
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