UniKey is a very compact tool, does not need any additional libraries and does not require installation. UniKey version 4.3 RC5 better support for the new Edge browser.
When starting UniKey, you see the following dialog box:
Click the "Expand" button to find out what you need.
Check if the box "Vietnamese interface" is checked. Uncheck it, the whole interface will switch to English.
You should always set "Encoding" to Unicode . The encoding is basically how characters like "ư" and "a" are represented as numbers that a computer can process. Microsoft Office programs are set to handle Unicode by default. Unicode is considered to be an international standard. The only exception to this is when you use one of the old VNI fonts from many years ago.
"Typing method" is what a combination of keys will form a letter like "huh". You can choose TELEX (popular), VNI and VIQR. There is also a "Guide" button that gives you help in Vietnamese.
Finally there is the option "Start Windows Last". If it's yours, feel free to choose it. If it is someone else's computer, then we advise against doing so.
Then click "Close". The program will now be on the taskbar - unobtrusive, but still available when you need it.