remove index.php route= opencart 3

Add these three Line

RewriteCond %{THE_REQUEST} ^GET.*index\.php [NC]
   RewriteCond %{REQUEST_URI} !/system/.* [NC]
   RewriteRule (.*?)index\.php/*(.*) /$1$2 [R=301,NE,L]

After adding

# 1.To use URL Alias you need to be running apache with mod_rewrite enabled. 

 # 2. In your opencart directory rename htaccess.txt to .htaccess.

 # For any support issues please visit: http://www.opencart.com

 Options +FollowSymlinks

 # Prevent Directoy listing 
 Options -Indexes

 # Prevent Direct Access to files
 <FilesMatch "\.(tpl|ini|log)">
 Order deny,allow
 Deny from all
 </FilesMatch>

 # SEO URL Settings

 # If your opencart installation does not run on the main web folder make sure 
 you folder it does run in ie. / becomes /shop/ 

 RewriteEngine On
 RewriteBase /
 RewriteRule ^sitemap.xml$ index.php?route=feed/google_sitemap [L]
 RewriteRule ^googlebase.xml$ index.php?route=feed/google_base [L]
 RewriteRule ^download/(.*) /index.php?route=error/not_found [L]
 RewriteCond %{REQUEST_FILENAME} !-f
 RewriteCond %{REQUEST_FILENAME} !-d
 RewriteCond %{REQUEST_URI} !.*\.(ico|gif|jpg|jpeg|png|js|css)
 RewriteRule ^([^?]*) index.php?_route_=$1 [L,QSA]

 RewriteCond %{THE_REQUEST} ^GET.*index\.php [NC]
 RewriteCond %{REQUEST_URI} !/system/.* [NC]
 RewriteRule (.*?)index\.php/*(.*) /$1$2 [R=301,NE,L]

 ### Additional Settings that may need to be enabled for some servers 
 ### Uncomment the commands by removing the # sign in front of it.
 ### If you get an "Internal Server Error 500" after enabling any of the 
 following settings, restore the # as this means your host doesn't allow that.

 # 1. If your cart only allows you to add one item at a time, it is possible 
 register_globals is on. This may work to disable it:
 # php_flag register_globals off

 # 2. If your cart has magic quotes enabled, This may work to disable it:
 # php_flag magic_quotes_gpc Off

 # 3. Set max upload file size. Most hosts will limit this and not allow it to 
 be overridden but you can try
 # php_value upload_max_filesize 999M

 # 4. set max post size. uncomment this line if you have a lot of product 
 options or are getting errors where forms are not saving all fields
 # php_value post_max_size 999M

 # 5. set max time script can take. uncomment this line if you have a lot of 
 product options or are getting errors where forms are not saving all fields
 # php_value max_execution_time 200

 # 6. set max time for input to be recieved. Uncomment this line if you have a 
 lot of product options or are getting errors where forms are not saving all 
  fields
 # php_value max_input_time 200