Multi-select dropdown element expands on its input field in "Classification browse" settings

Steps to reproduce:
1. Go to “Settings” >> “Inventory” >> “Classification browse”
2. Click on the “Edit” (pencil) icon next to “Classification (all)” option.
3. Click on the appeared multi-select dropdown in “Classification identifier types” column
Expected result: Expanded dropdown shouldn’t overlap input field.
Actual result: Expanded dropdown overlap input field of multi-select element. User will not see options already selected (only by dark gray highlight)
See attached screenshot: