For an introduction about custom trigger, Click Here.
You can use a custom trigger to come up with your own button or a link to open Accessibility Enabler.
This sometimes helps to match with your current site design. This implementation may need your developer’s Help.
Go to Accessibility > Widget Preferences > Trigger section
Click on Hide standard trigger
Check the box of Use Custom Trigger
Provide Custom Trigger ID in the text box given.
Click on Save button on the right top corner.