With most WordPress carousel sliders, you don’t get the option to make a specific slide active by default. So if you want to make a specific slide active in a carousel slider, it can be a bit challenging but not so with the Carousel Anything block from The Plus Addons for Block Editor. With our Carousel Anything block, you can easily choose any slide as the active slide.
To check the complete feature overview documentation of The Plus Addons for Block Editor Carousel Anything block, click here.
Requirement – This widget is a part of The Plus Addons for Block Editor, make sure its installed & activated to enjoy all its powers.
To do this add the block on the page and after you’ve created your slides go to the Style tab, Layout > Active Slide and from the dropdown choose the slide number you want to set as active.

Also, check How to show/hide Arrows & Dots in WordPress Carousel slider.