The Qi theme has minimum server requirements to run properly. We recommend setting parameter values on the server as follows, or to larger values:
max_execution_time=300
memory_limit=128M
upload_max_filesize=128M
post_max_size=256M
max_input_vars=3000
To check the parameter values on your server, you can use the free WP-ServerInfo plugin:
https://wordpress.org/plugins/wp-serverinfo/
After installing this plugin, navigate to Dashboard -> WP-ServerInfo -> Display PHP Information and check the parameter values specified above:
If your parameter values are too low, ask your hosting provider to increase the parameter values for you.
For example, if the max_input_vars parameter is too low, the theme options under Qode Essential Addons -> Options may not work as expected. Increasing the max_input_vars parameter setting should resolve the issue.