Legacy Title = if it ain't broke, don't fix it.
So I had my project edited and finished. Rendered, saved it, closed the program until my collaborator could come take a look. When I opened the program, it asked if I wanted to install the new Essential Graphics thing that was supposed to replace Legacy Titles. I said okay. When I opened up my project, EVERY TITLE was totally f***ked up (duration, transparency, cropping, font sizes, movement... everything that a Title could have go wrong, was wrong). And as a bonus, now I don't even know how to fix it, and I won't until I relearn everything. Hours of work down the drain, and now my organization has to adjust the whole timeline for the project because Adobe -- the best graphics suite in the world -- couldn't manage to give me an update that didn't botch my project.
Legacy titles were brilliant. One of the most intuitive, easy-to-set features in the program. This all makes no sense.
Rant concluded.

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Angela Smith commented
Every time I open a project, it asks me if I want to upgrade the titles. I say no, but there is no "do not ask again" option, so it asks me every time and does not remember my "no." That simple check box would be a good addition. Is there a way to stop the program from asking?
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Jeff Baur commented
I couldn't agree more!! Just had the same experience and I'm extremely frustrated at all of the wasted time. Adobe--Please, please stop making "improvements" to your products that don't need fixing!! And the new export screen in PP22 is annoying too!!
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Hi Matthew,
one of two things might have happened.
a) After the conversion from Legacy Titles to Source Graphics you saw differences simply due to the fact that this is not lossless. Not every parameter translates as well as another. Some parameters do not exist for Essential Graphics. For these, no conversion can happen. Examples are crawls, slant or depth strokes to name a few.
You can read more about this here: https://helpx.adobe.com/premiere-pro/using/upgrade-legacy-titles.html
and there is also a FAQ: https://helpx.adobe.com/premiere-pro/using/legacy-titler-retirement-faq.html
b) If the video frame of a Legacy Title is different than the default sequence, then the upgrade title is moved out of position and likely out of view. This is a known bug and is already fixed in beta (which you can download through your Creative Cloud Desktop application). With the fix we will add one upgraded graphic for each sequence size the title was used in. So you might end up with 2 upgraded source graphics for one Legacy Title if the Legacy title was used in two different sequence sizes.
While we replace the Legacy Titles in sequences, we do not delete them in the project. So you can still pull in the Legacy Title and compare to the upgraded source graphic.
At this point you can also decide to not do the automatic upgrade when you open a project but upgrade the graphics one by one with the menu command "Upgrade Legacy Title" in the Graphics menu at the top. This way you could first create a duplicate and the only upgrade one to compare the results and see where you need to make edit after the conversion.
We know that this is a big change and this does affect existing projects of users and this might cost them valueable time. That is why we are retiring the Legacy Titler so slow (it has been called Legacy for years). Now is the time to start bringing projects over one by one.
If you run into specific issues that you believe the Motion Graphics team should be looking at or have more question, please continue reaching out like you did with this post.
Annika