@nick776,

is there a way to disable the "hide comment" function as you can see at the screenshot left side?

Use the CSS code below: 

#wpdcom .wpd-comment-right:hover .wpd-comment-footer .wpd-toggle, #wpdcom .wpd-comment-footer .wpd-sep {
     display: none !important;
}

is there a way to change the color of the rating-thumb

Use the code provided below: 

#wpdcom .wpd-up {
   color: #da7878 !important;
}
#wpdcom .wpd-up svg{
   fill: #da7878 !important;
}

color for the commentator as you can see at the screenshot left side.

Here is the code you can use:

#wpdcom.wpd-layout-2 .wpd-comment .wpd-comment-header .wpd-user-info .wpd-uinfo-bottom a{
   color:#da7878  !important;
}

Put the code in the Top Admin Bar > Customize > Additional CSS > "Additional CSS" textarea, save it, delete all caches and check again. 

The red marked value can be changed as you like.   

Please don't forget to press Ctrl+F5 (twice) on the frontend before checking.