No, you can't. I think the keyboard is great and I'm very happy with it. However, it is relatively heavy for its size. I use the white one to put my phone and tablet on and a lot more.
I only work with Mac. The @ sign appears on the K780 as follows:
Keyboard setting German: Start/alt key + G key
Keyboard setting German-Switzerland: Start/alt key + L key
Greetings
Michael
Since the keyboard works for Windows and Mac (just fine), the keys are written neutrally. The Windows key is programmed under "Start" by default (see product image).
The illustration for the K780 (CH, wireless) is incorrect. However, the delivered product is correct (with QWERTZ layout) .... by the way, is really recommendable.
System settings - Keyboard - Show keyboard and emoji overviews in the menu bar.
Select this, then you can display the keyboard overview via the menu bar and see the key assignment. Simply press Shift or Option and everything is displayed.
I use the combo (mouse + keyboard K780) exclusively with Bluetooth (without the USB dongle). Works flawlessly across different devices. Maybe this answers your question indirectly or offers you an alternative ;-)?
With "shift" and the exclamation key (it's just to the left of "enter").
If another character appears, I would check the language setting of the PC, tablet, notebook or phone. This should be set to German (Switzerland).
Product images of laptops and keyboards are always illustrations and are practically never shown in the CH layout (not even by the manufacturer). Normally, the US layout is shown.
However, all products at Digitec are in the CH layout unless explicitly mentioned otherwise (see specifications).
You will receive this keyboard in the CH layout with QWERTY, large ENTER key, ö/é, ä/à, ü/è and the rest of the symbols, in the usual place, as you already know it.
I use the K780 for several devices. Changing channels by pressing a button on the F1-3 keyboard works perfectly, but I am not aware that the keyboard can also change channels by pressing a button on the mouse. But I'm only a customer here ;)
I see two questions.
1. can the keyboard be used even if the Logi software is not present? To answer this question, I uninstalled the Logi software from my Windows 10 computer and restarted the computer. It is in this state that I am writing this text. The answer is therefore clear: yes.
Does the connection between the keyboard and the office computer work? I cannot answer this question. But if a smartphone can be connected to your office computer via Bluetooth, there should be no problem with the keyboard.
For me (with Huawei Mate 10), it works without any problems with ESC. At least I can get to the lock screen. But the keyboard cannot yet recognise the face to unlock the smartphone completely :-)