Sayful Islam

use heightstyle='content' like this
[accordion id='' heightstyle='content'][item title='YOUR_TITLE_GOES_HERE']YOUR_CONTENT_GOES_HERE[/item][/accordion]

Yes, it is possible to collapse all sections.
Just add active='false' like this
[accordion id='unique-id' active='false'][item title='YOUR_TITLE_GOES_HERE']YOUR_CONTENT_GOES_HERE[/item][/accordion]

Sorry I can’t understand your problem. Please explain detail and give a live link and share your code.

Try this code:
[accordion id='industry_acc' collapsible='true'][item title='Hosp Structure']Departments in the hospital[/item][item title='Vendors']Epic[/item][item title='Key IT Positions']CIO, Manager, Analysts[/item][/accordion]

View the example code from description or Screenshot

Upgrade to newer version and follow the instruction. Add a new attribute inside shortcode like this [carousel id="unique-id"].

This slider will automatically adjust with you desktop size.
To control number of image on slider go to Settings >> Carousels and set how many image you want to show on different display size.

I mentioned on Description that the plugin is based on OWL Carousel that is famous plugin and very light. I found from your your shared link that you used many image and the size of image is very high. You can use online image compressor link tinypng to reduce image size.
I hope your problem will be solved.
Sayful Islam

Hello,
Thank you for your review but it should work perfectly.
Follow the instruction from Description.

No,it is not only for mobile devices but also for desktop. You can control it from Settings>> Carousels.

Hi,
Thank you for your reviews. This was my first WordPress plugin. It may some problem but it should not increse loading time because its file size only 3kB (893 bytes image + 2.1 kB javascript). Now I redesigned it and I think it will decrese loading time.
My english may be wrong. English is not my mother tongue but you can help me by suggesting where I have to change and I will be very glad to you.
Thanks,
Sayful Islam

Currently this plugin does not support widgets. But you can do it manually. To do this go to plugin folder and open accordion.php file at any text editor and find comment line
/* Generates Toggles Shortcode */
and above this line copy and paste the following code
add_filter('widget_text', 'do_shortcode');
and now go to widget and create a text widget and inside text widget write the following code
[sisaccordion][sistoggle title='' desc=''][/sisaccordion]

Repeat [sistoggle title='' desc=''] as many as you want element to include.
Go to WordPress admin Setting >> sis-accordion and set your desire options.

Go go your WordPress admin panel then go to Settings + sis-accordion and select sis_accordion_collapsible and
Collapse all panels = Yes
Thank you.
Sayful

Can you send me the code that you have written in post editor and you style sheet @ https://sis.netai.net/ ?

Yes. It is possible to add photos inside of the accordion description field.
Just write:
<img src="GIVE_YOUR_IMAGE_LINK_HERE" alt="">
Example:
<img src="https://lorempixel.com/400/200/sports/1/" alt="">

Thank You