Bottom Sheet FullExpanded State and IsModal Interaction Issues

[haideralifaizi]

Description

On Android, when setting IsOpen = true, the bottom sheet correctly opens in the FullExpanded state when AllowedState is set to FullExpanded. However, on second time or later openings, the bottom sheet opens in a HalfExpanded state instead of fully expanding.

To temporarily fix this, setting FullExpandedRatio="1" and HalfExpandedRatio="1" helps, but it does not completely resolve the issue. It appears that after the first opening, the AllowedState is internally changed to HalfExpanded, causing the unexpected behavior.

Second issues, when setting IsModal = true, the expected behavior is that user interactions outside the bottom sheet should be blocked. However, clicking outside the bottom sheet closes it instead of preventing interaction.

Steps to Reproduce

Set IsOpen = true with AllowedState="FullExpanded".
The bottom sheet opens correctly in FullExpanded state.
Close the bottom sheet.
Reopen the bottom sheet by setting IsOpen = true again.
The bottom sheet opens in HalfExpanded state instead of FullExpanded.

Set IsModal = true.
Open the bottom sheet.
Click outside the bottom sheet.
The bottom sheet unexpectedly closes, even though IsModal should prevent this.

Version with bug

1.0.3

Is this a regression from previous behavior?

No, this is a new issue

Last Known Working Version

1.0.2

Affected platforms

Android

Affected Platform Versions

10

Have you found a workaround?

No response

Relevant log output

[naveenkumar-sanjeevirayan]

Hi @haideralifaizi ,

Issue 1: Bottom Sheet Opens in HalfExpanded State Instead of FullExpanded

Thank you for bringing this issue to our attention. We have reviewed your report and were able to replicate the issue with the BottomSheet control.

The resolution for this issue will be included in our upcoming toolkit release. We appreciate your patience and understanding.

Issue 2: Bottom Sheet Closes on Outside Click Despite IsModal Being Set to True

We understand that your expectation is for IsModal = true to completely block interactions outside the bottom sheet, preventing it from closing when clicking outside.

Currently, the IsModal property is designed to disable background interactions by displaying a gray overlay. However, tapping this overlay is treated as a close action for the bottom sheet. This behavior is intentional, as the overlay serves both to block interactions and to provide a way to dismiss the sheet.

For more details, please refer to the help documentation:
Customization in .NET MAUI Bottom Sheet (SfBottomSheet) | Syncfusion®

In our upcoming release, we will improve the overlay tap behavior on BottomSheet. Instead of closing, it can now be configured to transition to a collapsed state based on your requirements. We appreciate your patience and understanding until then.

Thanks,