Multi-selection for label instances not working

[e-dzia]

Describe the bug When labelling data with bounding boxes and choice labels (per region) it should be possible to label multiple objects at once. This is not possible at the moment - when I select multiple objects, the choice label disappears.

To Reproduce Steps to reproduce the behavior:

1. Create a project with labelling template:

   <View>
   <Image name="image" value="$image"/>
   <RectangleLabels name="label" toName="image">
   <Label value="Airplane" background="green"/>
   <Label value="Car" background="blue"/>
   </RectangleLabels>
   <Choices name="color" toName="image" perRegion="true" choice="single">
   <Choice value="blue"/>
   <Choice value="white"/>
   <Choice value="yellow"/>
   </Choices>
   </View>

2. Draw a few objects/regions of any type.
3. Select more than one object at once,
4. The "color" choice tag is not visible anymore.

Expected behavior The choice label shouldn't disappear. It should be possible to add a label to multiple objects/regions at once.

Screenshots When choosing one object the color choice is visible: When choosing multiple objects the color choice is not visible:

Environment (please complete the following information):

• OS: Ubuntu 20.04 LTS
• Label Studio Version 1.7.3

Additional context This is not in accordance with the documentation - this functionality was introduced in version 1.3 - https://github.com/heartexlabs/label-studio/issues/655

[AbubakarSaad]

Hello e-dzia,

Try removing "preRegion" attribute from. PerRegion attribute works if you select a certain region. If you do it without it, it will select for all the regions.

[e-dzia]

Hello AbubakarSaad!

The thing is I don't want to label all of the regions at once. There can be 3 white and 5 blue airplanes in one picture and I'd like to label them by selecting first white airplanes and labelling them and then blue airplanes and labeling them. I cannot see it working this way right now.

[AbubakarSaad]

Sorry for the late reply, but you can use "choice=multiple" and remove the "perRegion" attribute as that doesn't support multiple region:

  <Image name="image" value="$image"/>
  <RectangleLabels name="label" toName="image">
    <Label value="Airplane" background="green"/>
    <Label value="Car" background="blue"/>
  </RectangleLabels>
  <Choices name="color" toName="image" choice="multiple">
    <Choice value="blue"/>
    <Choice value="white"/>
    <Choice value="yellow"/>
  </Choices>
</View>```