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Build: AI-191.6707.61.35.5529924, 201905031752,

AI-191.6707.61.35.5529924, JRE 1.8.0_202-release-1483-b01x64 JetBrains s.r.o, OS Windows 10(amd64) v10.0 , screens 1600x900, 1920x1080

AS: 3.5 Beta 1; Android Gradle Plugin: 3.5.0-beta01; Gradle: 5.4; NDK: from local.properties: (not specified), latest from SDK: (not found); LLDB: pinned revision 3.1 not found, latest from SDK: (package not found); CMake: from local.properties: (not specified), latest from SDK: (not found), from PATH: (not found)

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If you have <data> tag defined in a <layout> tag in an layout.xml, it is impossible to drop a view element on that layout. If you temporarily removes the <data> tag you can drop the view on the layout.

You can test it with this base layout:

<?xml version="1.0" encoding="utf-8"?>
<layout
        xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools">

    <data>
        <variable name="booleanVariable" type="boolean"/>
    </data>

</layout>

A.
1. Create new layout.xml
2. Enter text above
3. Go to design mode.
4. Try to drag an drop the "ConstraintLayout" widget onto the layout.
5. --> Nothing happens.

B.
6. Go to edit mode
7. Cut out the <data> element
8. Go to design mode.
9. Drag an drop the "ConstraintLayout" widget into the layout.
11. --> Everything is OK...
10. Go back top edit mode.
11. Paste the <data> element onto the <layout> tag.

==> It should be OK to drop a view onto the layout regardless if the <data> tag exists or not...

RG