Hi Julien,
Greetings from Syncfusion Support.
We have checked the reported case at your end, and suggest you to use view specific settings for header rows. Please refer to the following sample and code snippet.
<e-views>
<e-view option="Day"></e-view>
<e-view option="Week"></e-view>
<e-view option="TimelineMonth" [headerRows]="headerRowsForMonths">
</e-view>
<e-view
displayName="4 Month"
option="TimelineMonth"
[interval]="monthInterval"
[headerRows]="headerRowsFor4Months"
>
</e-view>
</e-views>
public headerRowsFor4Months: HeaderRowsModel[] = [
{ option: "Month" },
{ option: "Week" },
{ option: "Date" }
];
public headerRowsForMonths: HeaderRowsModel[] = [{ option: "Date" }];
Please try the above solution and get back to usif you need any further assistance.
Regards,
Nevitha