It's not "best to hide them", IMHO. Sorry, Jim. They'll just come back and bite you when you least expect it.
Fix the problem. Delete the placeholders and enter whatever correct transaction should have been there in its place.
Next time during a transaction download, if Quicken offers to create a new placeholder ... decline. Research the issue and input whatever it takes to fix it correctly.
Note just for a quick background about what a placeholder is. A placeholder is to shares as a balance adjustment is to a reconcile.When you reconcile an account if you don't have the proper transactions then you can't "balance" the account, and if you give up on that process and have Quicken put in a balance adjustment. It will correct the balance, but you will never have all the correct transactions.When you take some action that adds or removes shares without the proper transactions so that Quicken can't tell when they were bought/sold Quicken is going to suggest a placeholder. It "fixes" the number of shares, but the underline transactions are still missing. So Quicken can't do proper calculations, and as such like UKR said you will run into problems down the road when you do reports or need to buy/sell those shares and such.Note if you don't have the full history on when the shares were bought or sold, probably the next best suggestion would be to figure out about what the cost per shares is and enter that.Also you can use the placeholders as a guide of where you need buys/sells.As in if a placeholder added 10 shares of a security on 1/1/2017, then delete that one, and add a buy for it. So you can go through the placeholders replacing them in that manner.
This program is to hard to put in the data and fix errors.
Why is it so hard to just edit the investment entries? Quicken keeps putting in the stupid place holders and it messes everything up.
Here is my question. By the statement above do you go to reconcile and put in all the data there?