Congrats on this fresh theme, this is the first full functional MyBB 1.9 like  
 

Being in the test phase I have some questions:

1. Why the famous Rin Editor plugin is not compatible with Curves UI? If I choose Rin editor from the theme settings /  Editor Style,  the editor bar  looks like this. All the other styles work well.

 

L.E. Solved

2. How to permanently remove the red moderation notice on index: "Awaiting Moderation: x unread reports, x unapproved threads, x unapproved posts and x unapproved attachments." ?

3.  How can I replace the default black background in header with a custom image? 

I solved adding a logo in header by adding on header template:

Code:

<div class="logo"><a href="https://www.mydomain.com/index/"><img src="images/logo.png" /></a></div>

but for replacing the black bar with a custom image I have no solution, except removing this entire row from header template and losing the Portal feature:

Code:

<nav class="navbar navbar-dark navbar-expand-lg bg-dark py-4 border-bottom-nav">

4. All the unread threads in forums or PM's are shown without bold, like the read ones so it's impossible to distinguish the unread threads. How to bold all the unread threads & PM's  in a way to figure out that I have unread posts inside? Maybe I messed something up in global CSS when I changed the colors of the forum...

5. When updating to new versions all my custom modifications in terms of global CSS (custom theme colors) and templates will be reverted to the original ones?

6. When watching the threads in a forum I see no last post button, in order to point me to the last post unread. I can see the user who posted last time and the date but I have no sign or link or button to take me directly to the last post undread in that thread.

Hi Lyvyoo,

I apologise for having not responded to this. I’ve been preoccupied with travel and study. I’ll take a look at this first thing in the morning and will most likely add the fixes to the GitHub repo. They are only minor fixes.

2. How to permanently remove the red moderation notice on index: "Awaiting Moderation: x unread reports, x unapproved threads, x unapproved posts and x unapproved attachments." ?

Whilst I don't recommend removing it, you can do so by editing the header template and removing {$modnotice}

3.  How can I replace the default black background in header with a custom image? 

I solved adding a logo in header by adding on header template:

Code:

<div class="logo"><a href="https://www.mydomain.com/index/"><img src="images/logo.png" /></a></div>

but for replacing the black bar with a custom image I have no solution, except removing this entire row from header template and losing the Portal feature:

Code:

<nav class="navbar navbar-dark navbar-expand-lg bg-dark py-4 border-bottom-nav">

In global.css find bg-dark and add the background image:

Code:

.bg-dark {
background-image: url('path/to/your/image.jpg');
  /* Optional properties to control image display: */
  background-size: cover; /* Scales the image to cover the entire div */
  background-position: center; /* Centers the image within the div */
  background-repeat: no-repeat; /* Prevents the image from repeating */
}

4. All the unread threads in forums or PM's are shown without bold, like the read ones so it's impossible to distinguish the unread threads. How to bold all the unread threads & PM's  in a way to figure out that I have unread posts inside? Maybe I messed something up in global CSS when I changed the colors of the forum...

This has just been fixed in the latest release on both GitHub and Extend.

5. When updating to new versions all my custom modifications in terms of global CSS (custom theme colors) and templates will be reverted to the original ones?

Essentially, yes. The best way to do it is to save a backup of your global.css, go to the GitHub repo and manually input the changes/updates into the templates and global.css file.

6. When watching the threads in a forum I see no last post button, in order to point me to the last post unread. I can see the user who posted last time and the date but I have no sign or link or button to take me directly to the last post undread in that thread.

This has just been fixed in the latest release on both GitHub and Extend.