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I use admin-tools to create à .htacces file with defaults options.
In the generated file i am obliged to comment 6 of the following lines
othewise the 'maximenu CK' does not work properly.
Mybe is there a way to get 'maximenu CK' working an keep better security.

commented lines are designed by ################# in the following bloc.

##### Advanced server protection -- BEGIN
RewriteCond %{QUERY_STRING} \=PHP[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12} [NC]
RewriteRule .* - [F]
## Back-end protection
RewriteRule ^administrator/?$ - [L]
RewriteRule ^administrator/index\.(php|html?)$ - [L]
RewriteRule ^administrator/index[23]\.php$ - [L]
RewriteRule ^administrator/(components|modules|templates|images|plugins)/.*\.(jpe|jpg|jpeg|jp2|jpe2|png|gif|bmp|css|js|swf|html|mpg|mp3|mpeg|mp4|avi|wav|ogg|ogv|xls|xlsx|doc|docx|ppt|pptx|zip|rar|pdf|xps|txt|7z|svg|odt|ods|odp|flv|mov|htm|ttf|woff|eot|JPG|JPEG|PNG|GIF|CSS|JS|TTF|WOFF|EOT)$ - [L]
RewriteRule ^administrator/ - [F]
## Allow limited access for certain Joomla! system directories with client-accessible content
#################RewriteRule ^(components|modules|templates|images|plugins|media|libraries|media/jui/fonts)/.*\.(jpe|jpg|jpeg|jp2|jpe2|png|gif|bmp|css|js|swf|html|mpg|mp3|mpeg|mp4|avi|wav|ogg|ogv|xls|xlsx|doc|docx|ppt|pptx|zip|rar|pdf|xps|txt|7z|svg|odt|ods|odp|flv|mov|ico|htm|ttf|woff|eot|JPG|JPEG|PNG|GIF|CSS|JS|TTF|WOFF|EOT)$ - [L]
#################RewriteRule ^(components|modules|templates|images|plugins|media|libraries|media/jui/fonts)/ - [F]
## Disallow front-end access for certain Joomla! system directories (unless access to their files is allowed above)
RewriteRule ^includes/js/ - [L]
RewriteRule ^(cache|includes|language|logs|log|tmp)/ - [F]
RewriteRule ^(configuration\.php|CONTRIBUTING\.md|htaccess\.txt|joomla\.xml|LICENSE\.txt|phpunit\.xml|README\.txt|web\.config\.txt) - [F]
## Disallow access to rogue PHP files throughout the site, unless they are explicitly allowed
#################RewriteCond %{REQUEST_FILENAME} (\.php)$
#################RewriteCond %{REQUEST_FILENAME} !(/index[23]?\.php)$
#################RewriteCond %{REQUEST_FILENAME} -f
#################RewriteRule (.*\.php)$ - [F]
## Disallow access to htaccess.txt, php.ini and configuration.php-dist
RewriteRule ^(htaccess\.txt|configuration\.php-dist|php\.ini)$ - [F]
##### Advanced server protection -- END

The .htaccess Maker assumes that all PHP programs are called through the main index.php files, with the specifics passed as arguments. Any PHP program that is called directly will cause a problem under the default setup, usually a 403 error. You need to set these directly called PHP files (css, images, etc.) as exceptions.
You can diagnose what is being called and blocked with the instructions here: https://www.akeebabackup.com/documentation/troubleshooter/athtaccessexceptions.html. Once you have added the necessary exceptions, your menu can work with the .htaccess file.