How to make first letter Big in each post

In https://demo.alxmedia.se/hueman/demo/typography/ the author say how to make this.

Example:

Welcome

[dropcap]W[/dropcap]elcome

thanks got it

there is any way to make dropcap first letters in all posts in one time or I have to do it manually one by one?

Somehow all I get is: “[dropcap]D[/dropcap]et er” showing in the tekst of the post, instead of a BIG D ???

MrPingo, use new edition of theme from here https://alxmedia.se/themes/hueman/