1. I have Google API key, but still unable to view V2 google satellite and street maps. Normal google street and satellite is viewable.
Could it be you're not using the API key correctly? You don't show your Web Login dialog. See the File - Create - New Data Source topic.
Also, that you have an API key doesn't mean that you're not being blocked by Google. For example, if Google wants to charge you money and your credit card doesn't pay up, that key won't work. If Google thinks you weren't using that API in accordance with whatever terms applied when they issued it to you, they might also block it. Stuff like that is a question for Google.
However when right click on record value of mfd_id column, add filter and choose>50000, it works and exhibits another 50k records.
Easier to click the placeholder.
The fill record placeholder
You can just click the placeholder to see the next 50K. That's easier. See the Tables topic.
Ctrl+F cannot be used for range outside the data being exhibited?
Correct. It's an interactive command that works on what you can see in the table.
When working with large tables it's a good idea to break the habits that work well for small tables but which don't work efficiently for big tables. The general rule with big tables is to use queries, or at least the command window.
But What I get is shown in file below.
Just guessing, since I don't know your data or your workflow: Try refreshing the table, like closing it and opening it, since after the merge it might not yet have been updated.