"sign" button not showing

[mojitoo2]

Describe the bug
"sign" button is not showing

To Reproduce
Steps to reproduce the behavior:

1. on "transaction" section click on "continue"

3. click on "paste"

5. "sign" button not showing

Desktop (please complete the following information):

• MACOS: 11.6
• Version of Grin-gui [e.g. v0.1.0-alpha.4 or a commit hash of the build]