Expanding List Type in Power BI

Hi Experts,

In my desktop report,  I have "Sharepoint Online List" connector. One of the columns is of Type "List". When I try to expand it by going through the "Tranform Data", there's no Expand button.

I tried this step, after going through different threads.

and then this step

After clicking "OK", I get this again with no "expand " button.

What I am doing wrong?

How can I get a single value from this "List"

My List data has values like this (exported my sharepoint list to excel)

ABC;#12

DEF;#45

.....

and I want values before ; i.e ABC, DEF

I saw some posts using M code, ut couldn't understand 

Please help....

Thanks for you help......