What is the difference between Combo box and Dropdown in Power Apps?

Have you ever added a Dropdown in Power Apps and later realized you needed Search, Multi-Select, or Custom Values?
It happens to almost everyone.

That’s when you discover the Combo Box control.

This difference between combo-box and drop down in power apps  is a very common Power Apps interview question

Let’s understand it in a simple way.

Difference between Combo Box and Dropdown in Power apps — Quick Summary

🎬 You can also watch this full video to understand the difference

🎁 Download the full Power Apps Interview Q&A guide — includes this and 20+ real interview examples.

Following are the key differences

1️⃣ Multi-Select Support

• Combo Box → Select more than one item
• Dropdown → Only one item at a time

2️⃣ Search Option

• Combo Box → type to find results
• Dropdown → scroll only

3️⃣ Showing Existing Selected Record

• Combo Box needs DefaultSelectedItems property:

DefaultSelectedItems = Filter(Employees, ID in SelectedEmployeeIDs)

• Dropdown uses simple Default property:

Default = "Rahul"

4️⃣ Custom Values

• Combo Box → Users can type their own value
• Dropdown → No custom input allowed

5️⃣ Multiple Columns Display

• Combo box offers Layout (Single/Double Column)
• Dropdown = only one column

If asked in interview

“A Combo Box supports multi-select, searching, custom values, and displaying multiple columns.
A Dropdown only supports single selection and no search.
A Combo Box can act like a dropdown (if search + multi-select are disabled), but not the opposite.”

When to use what

This table explains where to use combo box and where to use dropdown.

Here is the summary for this :

Recommendation:
If unsure, start with a Combo Box → you can always disable advanced features.

Frequently Asked Questions (FAQs)

Q1: Which control is best for Dataverse lookup fields?
Combo Box

Q2: Can a Dropdown be converted to Combo Box features?
No  — But Combo Box can behave like a dropdown.

Q3: Can Combo Box show 2 fields (like Name + Role)?
Yes  using Layout → Double

Q4: Which is asked more in interviews?
Combo Box — because it involves real business scenarios.

You can learn more about combo box control from microsoft documentation website.

Next: What is the difference between Concatenate and Concat in Power Apps?

click here to learn 300+ Power apps Interview questions and answers