Hi, I will list the steps as asked.
- Please give feedback, if your problem is solved. :-)
- Please pay attention to the documentation link Mathilde posted, when follwing the steps.
Steps:
1) OnyOffice
You need OnlyOffice for the presentation app to work. I stress this out because in your screenshot is the spreedsheat app missing, which almost all users install. Since the spreadsheet app also needs OnlyOffice, I guess you have not installed it. Pelase see: https://docs.cryptpad.org/en/admin_guide/installation.html#onlyoffice-optional
2) Enable Apps
You can enable or disable single apps, so please check, if the presentation app is enabled in the adminstration menu. Please see:
https://docs.cryptpad.org/en/admin_guide/admin_panel.html#instance-applications
3) Enable EarlyAccess
The presentation app (and the document app) are so called early access apps. This means you have to additionally enable them in a config file. The reason is, that these apps aren't stable yet, so you may loose data.
Please set: AppConfig.enableEarlyAccess = true;
This is done in your application_config.js in your customize directory.
Please see: https://docs.cryptpad.org/en/admin_guide/customization.html#instance-customization
(This means you should not edit the original application_config.js but instead use the customization directory for individual - well - cutomizations.)
4) Restart
The EarlyAccess activation may need a restart of the cryptpad service to take effect.