Please stay on-topic. It's hard enough to follow all the different issues in this thread already.
It's a button on the default toolbars. You're using your own custom toolbars, which complicates things.
Details mode is one of the ways you can view things in Opus, like Thumbnails mode. On your toolbars, it looks like it is the 2nd icon after your Z drive.
You already know how to add columns as you've added the Full Path column.
If you switch into Details mode, you can then add the Thumbnail column, which lets you see the thumbnail for each file alongside other information/columns, like Name, Extension and Full Path.
(When looking at the list of columns, Thumbnail is in the General category.)
Directory Opus is the name of the software. GPSoftware is the name of the company which makes the software. Like Google is the company which makes Chrome.
If you look in your own screenshot of the website, at the URL, you will see it says GPSoft.com.au. That is the company who makes Directory Opus.
If you're confused by the folder Opus is installed in then you're presumably also confused about Chrome being installed under C:\Program Files\Google\Chrome instead of C:\Program Files\Chrome.
I suggest you just don't worry about where the exe and dll files are. There is not usually any need to look at them.
This is getting silly now.
"GPSoft" is literally in your own screenshot, as well as in several places around the site.
It should not confuse you this much that the name of a company is not always the same as the name of one of that company's products. This is absolutely normal. Please drop the subject.
I am locking this thread as it's hard to follow, with so many different things being discussed at once, and it makes it difficult for other people who come to the forum with similar questions.
If you still need help with anything, please start a new thread for each question (unless the questions are closely related). Further rationale can be found here: