If anyone wants to keep an accordion tab always open even when they click on other tabs, he/she can do this by following custom CSS code. For example, if someone wants to keep the first accordion tab always open. For that, he/she needs to use the custom CSS code to the plugin’s Settings → Custom CSS and save it.

#sp-ea-18.sp-easy-accordion>.sp-ea-single:nth-of-type(1) > .ea-header {
    pointer-events: none;
}
#sp-ea-18.sp-easy-accordion>.sp-ea-single:nth-of-type(1) > .spcollapse {
    display: block !important;
}

Note: Replace the shortcode ID (#sp-ea-18) from the CSS with yours. Besides, you can select the

tab you want to keep open by writing the tab number in the CSS code nth-of-type(5).