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In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 23.0.3
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): Apache2
PHP version (eg, 7.4): 7.4
The issue you are facing:
I got a problem in configuring LDAP over Web-IF.
Seems that no Javascript is executed.
Reason: See console log
Refused to execute script from ‘https://domain/index.php/apps/dashboard/’ because its MIME type (‘text/html’) is not executable, and strict MIME type checking is enabled.
This leads to:
Uncaught TypeError: $element.multiselect is not a function
at Class._initMultiSelect (wizardTabGeneric.js?v=1bc9356a-1:382:13)
at Class.init (wizardTabAbstractFilter.js?v=1bc9356a-1:45:9)
at Class.proto. [as init] (wizardObject.js?v=1bc9356a-1:37:21)
at Class.init (wizardTabUserFilter.js?v=1bc9356a-1:62:9)
at Class.proto. [as init] (wizardObject.js?v=1bc9356a-1:37:21)
at new Class (wizardObject.js?v=1bc9356a-1:47:15)
at new Wizard (wizard.js?v=1bc9356a-1:55:13)
at wizard.js?v=1bc9356a-1:79:2
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- I dont know
The output of your Nextcloud log in Admin > Logging:
{"reqId":"eLflJhW3F2ti6n13b8I4","level":3,"time":"April 20, 2022 19:49:36","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Uninitialized string offset: 0 at /var/www/nextcloud/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php#39","userAgent":"--","version":"23.0.3.2","exception":{"Exception":"Error","Message":"Uninitialized string offset: 0 at /var/www/nextcloud/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php#39","Code":0,"Trace":[{"file":"/var/www/nextcloud/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php","line":39,"function":"onError","class":"OC\\Log\\ErrorHandler","type":"::"},{"function":"OC\\Core\\Command\\Maintenance\\Mimetype\\{closure}","class":"OC\\Core\\Command\\Maintenance\\Mimetype\\GenerateMimetypeFileBuilder","type":"->","args":["*** sensitive parameters replaced ***"]},{"file":"/var/www/nextcloud/core/Command/Maintenance/Mimetype/GenerateMimetypeFileBuilder.php","line":40,"function":"array_filter"},{"file":"/var/www/nextcloud/core/Command/Maintenance/Mimetype/UpdateJS.php","line":57,"function":"generateFile","class":"OC\\Core\\Command\\Maintenance\\Mimetype\\GenerateMimetypeFileBuilder","type":"->"},{"file":"/var/www/nextcloud/3rdparty/symfony/console/Command/Command.php","line":255,"function":"execute","class":"OC\\Core\\Command\\Maintenance\\Mimetype\\UpdateJS","type":"->"},{"file":"/var/www/nextcloud/3rdparty/symfony/console/Application.php","line":1009,"function":"run","class":"Symfony\\Component\\Console\\Command\\Command","type":"->"},{"file":"/var/www/nextcloud/3rdparty/symfony/console/Application.php","line":273,"function":"doRunCommand","class":"Symfony\\Component\\Console\\Application","type":"->"},{"file":"/var/www/nextcloud/3rdparty/symfony/console/Application.php","line":149,"function":"doRun","class":"Symfony\\Component\\Console\\Application","type":"->"},{"file":"/var/www/nextcloud/lib/private/Console/Application.php","line":211,"function":"run","class":"Symfony\\Component\\Console\/
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
Not relevant
The output of your Apache/nginx/system log in /var/log/____:
Not relevant
Screenshot that leads from the issue. As one can see page is not loeaded correctly.
Output errors in nextcloud.log in /var/www/ or as admin user in top right menu, filtering for errors. Use a pastebin service if necessary.