Characters are not fully displayed after text substitution

Redwood performance-Employee evaluation page: We use the tool [User Interface Text] to customize the text of this paragraph in both Chinese and English. It may be much longer than the initial prompts provided by the system.

We want to know what the character limit is for text substitution here. Such as character length, format, etc.?

We are currently trying to replace in the test environment by the tool [User Interface Text], and the result is that the text is not fully displayed, only half displayed. And we can't do it with a page composer.

Please see the attachment for details.