Hello @Viktoriia,
Welcome to Atlassian Community!
As per your screenshot, I can see that you are using a next-gen project and currently, it's not possible to edit workflow in next-gen.
There is a feature request suggesting the implementation of this ability:
Please, click on vote and watch to receive updates about the feature.
If you need to use a custom workflow, please use a Classic Software project.
Regards,Angélica
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