Aleksandrs Davids Sidurins

was already on 0644, ok problem resolved after full upgrade to 4.6.12 alfa + beta, sign in error resolved too, there was a blocking connection from hosting side..

@Marc Stridgen, after latest patch it's even "worse":

Ok, that’s up to IPS indeed. I thought you were thinking it was a feature in the resource. My bad. 👍

Your server/network is blocking the request we are sending. Here's the error response:
ERROR 405 Your query not allowed for this location If you see this error, try to use another text in edditable fields, clean cookies and cache in your browser or copy error details and write support: support@pro-managed.com?subject=Error 405 Error text: Host: <community_url> Request: /cookies.html?backurl=https://<community_url>/index.php?app=core&module=system&controller=marketplace&pmtry=3 HTTPS: on Protocol: HTTP/2.0 User IP: <remote_ip> Browser: InvisionCommunity/1.0 Referer: Timemark: 1649405742 ErrorCode: 405 ClusterNodeID: M-24

Please check the System Logs for errors. More than likely there are a lot of errors you are being alerted to which need resolving. These could be from third party add-ons or something else. If you require further assistance, please update the access details in the Client Area so we can take a further look.

These lines in my nginx configuration have helped to overcome this:
proxy_connect_timeout 180s; proxy_send_timeout 180s; proxy_read_timeout 180s; fastcgi_send_timeout 180s; fastcgi_read_timeout 180s; I use Plesk and have a special field, where I can put this. It just a hint, that may help.  I am not a server expert, so do not ask me, how to add it to your server. 😊

@newbie LAC Many thanks for adding support for the prefixes. This is something I requested you a while ago!  Now it looks much better! Thumbs up for your support!

1. Tags or prefixes?
Post #2732495
Now 
2. Inbuilt Topic feed widget hasn't prefixes/tags
You use the application for this
I added 4 settings
- Show prefix in posts tab
- Show tags in posts tab
- Show prefix in topics tab
- Show tags in topics tab
I'll upload new version coming soon
Upd. I added 2 additional settings
- Condensed mode for tags in posts tab
- Condensed mode for tags in topics tab
 

Advanced Tags & Prefixes
For IPS 4.x
This application enhances IPS Community Suite 4's built-in tag and prefix system. It gives you custom styling and fine-grained control over prefixes, plus new settings, enhancements, and helpful moderation tools. Prefixes are explicitly created through the Admin CP, and can be chosen from a separate prefix dropdown when creating a topic or other prefix-enabled content.
View the Marketplace listing for more info and available features.
Please post any questions, feedback, or support issues here in the support thread.
Go to the Marketplace listing

If you only show 1 video, find 
<div class='ipsGrid_span1 ipsSpacer_bottom vbItem'> Replace by
<div class='ipsGrid_span1 ipsSpacer_bottom vbItem' {{if count( $videos ) == 1}}style='width: 100% !important;'{{endif}}>  

ACP > Customization > Themes > click </> to edit your theme > videobox > front > widgets > Videos

You can make one block like you see on screen, in right side with big windows?

Updated...

I need time for other customers ideas, reports. And I always give priority to fix bugs. About new features you need to wait, I will do if they are necessary. 
In your case, you no need to wait, you can use 'Customizable Video Feed' block. After placing it on site, click Edit button, set 'Number to show' = 1, 'Block theme' = 'Thumbnail with Title'. Save.  Then go to ACP > Customization > Themes > click </> to edit your theme > videobox > front > widgets > Videos
Find
<div class="esnList_item" {{if $orientation=='vertical'}}style="width: 33.33% !important;"{{endif}}> Replace by
<div class="esnList_item" {{if $orientation=='vertical'}}style="width: {{if count($videos)==1}}100%{{else}}33.33%{{endif}} !important;"{{endif}}> Save and done.