It is possible sometimes that your Elementor Widget Panel does not load properly and shows a blue spinner loading continuously.
As such, if the Elementor editor does not load you can solve it with the below solutions:
Increase the memory used by your WordPress.
Disable the features that you don't need.
you could have a JavaScript conflict with other Elementor plugins. You can check the console to see the errors.
Make sure you are using the latest version of Elementor, and Elementor Pro
If increasing memory doesn't solve your issue, check if there is any conflict due to plugins by disabling all the plugins except Elementor (+ Pro) or just Elementor Addon plugins that you use. If the issue persists, Ensure you meet the system requirements. You can check if your system meets the requirements by going to Elementor > System Info.
You can also disable your theme if it offers you special widgets for Elementor. If it works you can get to know the exact plugin which is caused by Enabling the plugins one by one.
Simply check for the settings of the alleged plugin if you can remove the unused widgets to load in the panel.
In a few cases, you may need to increase the value of max_input_vars. You can customize the php.ini file to edit this or ask your host to help with this.