adding previous next button by GB

Hello,

I am creating Previous Button and Next Button on the Sidebar for all my posts by GB Block.
The problem is when I open a post, the button appears but only the Next Button. (Because the Previous Button is unlinked).
For examples: this post
If I click on the Next Button, the next post comes out and the Previous Button also appears.
I would like to show both Buttons with their links when I click on any my post.
I hope you are understanding my issue.
Please give me some advises.

Best wishes,
Inoruhana