Hi Emanuele,
We have analyzed your query (“Themes working but some button for example arrows in according disappear”). We suspect that may be the “common-images” folder is not present inside in your application or may be the “ej.widgets.core.min.css”, “ej.theme.min.css” files and “common-images” folder not present in the proper folder structure. Please find the proper folder structure for Syncfusion themes as illustrated in the following screenshot.
For your convenience, we have prepared a simple sample with custom theme. Please find the sample on below location.
If still you face any difficulties, kindly get back to us with more information about the issue or please revert back the provided sample based on your application along with the replication procedure to reproduce the issue at our end. This would be more helpful for us to provide a better solution at the earliest.
In theme studio, we have provided option to change the theme color with download option. Please refer the below help document for “how to customize themes in theme studio”.
Please let us know, if you have concerns.
Regards,
Ashokkumar B.