You need to click the blue button to open the camera. If you click Get balance with zero addresses in the textarea, you won't see anything. You need to scan first (or to paste the addresses)
Blue button for scans, green button for pasted or scanned addresses
Okay, I think that was where my problem was initially coming from, because I just tried to click the blue button as suggested, scanned the QR code, and it's actually working perfectly fine, and one thing I observed was that the more QR codes I scanned, the more BTC balance I was having beneath each other as shown below.
Note: I was just only able to get 2 other BTC wallet address QR codes from Google and added with mine, making it 3 as shown below.
And secondly, I was able to test the address feature by copying over 23 Bitcoin wallet addresses from a signature campaign here on this forum to see how it works, and I must say Im impressed by how it works, as I was instantly able to get both the cumulative balance of the entire 23 Bitcoin wallet addresses and a detail balance of each individual wallet as shown below.
Conclusion: At this moment I think I can now say the tool is actually working fine as expected. Thank you