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Is your external monitor 4k? &nbsp;How much RAM do you have? &nbsp;Check your activity monitor to see if your system is getting overloaded.
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Is your external monitor 4k?  How much RAM do you have?  Check your activity monitor to see if your system is getting overloaded.

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My MacBook Pro (13”, 2017, Two Thunderbolt 3 ports, Mojave 10.14.5) is doing something weird when I try to use the hidden dock with some external screens. <br />
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Never had the problem before, but ever since hooking up to an HD screen (temporarily), my dock isn’t working properly with other second screens. <br />
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The dock doesn’t show up until I’ve held the cursor in place for 5–15 seconds on either screen, and even then it sometimes doesn’t appear. I’ve regressed to an unhidden dock for now, but this is not ideal. I’ve tried adjusting resolution size and a few other things, but nothing is working so far. <br />
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When I’m not using a second screen, I have no problems at all. Research has not giving me much to go on.
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My MacBook Pro (13”, 2017, Two Thunderbolt 3 ports, Mojave 10.14.5) is doing something weird when I try to use the hidden dock with some external screens. 

Never had the problem before, but ever since hooking up to an HD screen (temporarily), my dock isn’t working properly with other second screens. 

The dock doesn’t show up until I’ve held the cursor in place for 5–15 seconds on either screen, and even then it sometimes doesn’t appear. I’ve regressed to an unhidden dock for now, but this is not ideal. I’ve tried adjusting resolution size and a few other things, but nothing is working so far. 

When I’m not using a second screen, I have no problems at all. Research has not giving me much to go on.

Macbook hidden dock not appearing after using temp HD monitor

Apple's early computers ran on a variety of operating systems, including a Pascal version and one based on CP/M, before releasing its ProDOS with the advent of its 16-bit computer. With the release of the Lisa, which had its own OS, Apple and computing entered the graphical age; it was followed by the Macintosh, which offered a series of "System" operating systems. Other Mac operating systems included PowerPC until Apple acquired NeXT and folded it into the Mac OS. Current operating systems for Apple devices are Mac OS-X and iOS.