SD card icon on Surface Pro 4

If the microSD card(s) you have are working properly, leave it alone. There's
definitely something going on with Realtek card drivers as Microsoft has
documented some strange issues with these on the upcoming 1903 release. One of
my Surface devices is reporting this as a USB device, but my cards are working
fine. If it is only the ICON that is wrong let it be. (My other Surface shows
icons similar to yours, except labeled SDXC).

Next time you check for updates, it will automatically install the Realtek driver.To prevent this from happening again, you will need to prevent automatic driver updates from Windows.

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That is a pretty heavy handed "fix" for an issue that is not 'functional'.
Drivers sometimes have security fixes or are needed for the proper operation of
Windows.

I have the same problem; if you want to restore the old icon and get rid of "safely remove device icon" you have to do this: go to device manager/usb controller/Realtek/driver/update driver/let me choose/search in the computer/choose from a list and select USB mass storage (sry, I don't know the exact translation in english). Strange thing is that  in device manager the Realtek microsd card reader is as USB2 and not USB3 recognized or at least it is so in my system. This is true both in Win 10 1903 than in 1809 version because when I upgraded my sp4 to 1903 through update assistant  I noticed a strange  card reader's behaviour (sometimes the microsd disappeared from file Explorer and device manager, tested with different microsd cards, and the different icon in file Explorer); so I decided to format to solve the issue and I've restored my Surface with a downloaded Surface image (1703) and upgraded until 1809 just to be sure to get rid of strange/uncompatible drivers; after formatting I had immediately a big problem: the microsd card reader was recognised as "unknown device" in device manager and wasn't impossible to install its driver (also generic) to let it work and I've spent many hours to try to solve the issue with no luck. In device manager its ID hardware wasn't this: USB\VID_045E&PID_090C&REV_0118
USB\VID_045E&PID_090C but the ID hardware was changing from something like "compliance mode" or "failure something" saying the system couldn't reassign the door (port reset failure). I was almost sure the microsd card reader was faulty, I was tired and went to sleep. Yesterday (I formatted the day before yesterday) when I switched on my Surface the Microsd reader was finally recognized (I've done nothing during the night!!) and now it's working, or at least I hope so. Anyway the icon in file Explorer is as you described (I immediately changed the drivers to USB mass storage) , so I think the latest  drivers "Realtek USB 10.0.17763.31247" are buggy.
                                                                                                                                                                                                      On the image below you can see the unknown device USB3.0 Card Reader and the Realtek USB 2.0 Card Reader's drivers.     

Here is the official Microsoft link for the latest Realtek drivers (same ID hardware) where is stated they are USB2 and not USB3, definitely something wrong.   https://www.catalog.update.microsoft.com/ScopedViewInline.aspx?updateid=8f72e690-0b64-44c0-a2eb-15eb470f4837