How to enable the auto suggestion datatype in keil 5.18
Please detail your expectation - is it probably uVisions "Code Completion" you are asking for?
https://developer.arm.com/documentation/101407/0538/User-Interface/Using-the-Editor/Code-Completion
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Besides - it is recommended to migrate to the latest Keil MDK release, offered at:
https://www.keil.com/download/product/
With this release, do you still have the same question?