# Margin Line Modification
## How to modify the margin line
## Instructions
### Step 1
Select the margin line you wish to modify to enter the modification mode. In this mode, control points and the insertion direction of the margin line will be displayed, along with a cross-sectional view shown next to the mouse cursor.
### Step 2
Use the Margin Line Toolbar located in the upper left corner to modify the margin line.
#### 1. Point mode
Move existing points to adjust the margin line.
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Click on an empty area to add a new point.
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Right-click on a point to delete it.
#### 2. Pen mode
Freely draw the margin line in the desired area to modify it.
#### 3. Contract / Expand
Use the contract and expand buttons to shift the entire margin line upward or downward.
### Step 3
Once you have finished editing the margin line, click Apply to save the changes.
### Manual Margin Line Detection
After deleting the existing margin line, mark a starting point and place points along the margin of the abutment tooth to draw a new margin line.
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To complete the line, click on the starting point again.
{% hint style="info" %} **Quick Guide**
Manual margin line creation is only available in Point Mode.
{% endhint %}
Move existing points to adjust the margin line.
\
Click on an empty area to add a new point.
\
Right-click on a point to delete it.
#### 2. Pen mode 
Freely draw the margin line in the desired area to modify it.
#### 3. Contract / Expand 
Use the contract and expand buttons to shift the entire margin line upward or downward.
### Step 3
Once you have finished editing the margin line, click Apply to save the changes.
